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Thank you for the information. I had this problem and thought it was the monitor, since it was always the same monitor affected, and changing connection type (VGA, DisplayPort, HDMI) made no difference. FileVault is not in use. I look forward to your investigatory results.
One more for your collection of info: sometimes I can type in my password “blind,” and it will, after anything from 10 to 90 seconds, light up the screen. Not the whole screen at first, just the progress bar, but then it all shows up...
 


Ric Ford

MacInTouch
Not the whole screen at first, just the progress bar, but then it all shows up.
For what it's worth, this is similar to what I see when I boot the 2015 MacBook Pro with an external monitor attached and close the lid as it's booting - the external monitor first shows just the progress bar then finally the whole screen.
 


I get flashing 'interference' on my NEC display when my 2018 Mac goes into sleep mode, even though I am at that time using--and displaying--a completely different computer that happens to be simultaneously plugged into the same NEC monitor.

I have two computers plugged into my NEC MultiSync 2690WUXi monitor: one a 2018 Mac Mini, the other a Lenovo T450S laptop running Debian Linux. Both are connected by DVI ports to the same NEC monitor.

When I am using the Debian machine, if the Mac goes into sleep mode, I see a flashing screen, rendering it completely unusable.

My workaround is to reach over and click the mouse of the Mac and wake it up, without actually switching to the Mac on the monitor. This fixes the screen flashing.

I have never before had an issue where any Mac can ever affect the display of a different computer being actively used and simultaneously plugged into this NEC monitor.

It is such a weird problem that it is difficult to communicate to Apple or NEC support, and impossible to come up with a combination of search terms to find if anyone else is having this problem.
 


Re: 2018 Mac Minis not waking the display after waking from sleep, add me to the list of people having this issue. My 2018 Mini is connected to a 1080p Sharp TV via an AV receiver. With this configuration, the previous Mini's display appeared on the TV in a few seconds after waking it from sleep every time. (That is a mid-2009 Mini, connected via a DVI -> HDMI adapter.)

With the 2018 Mini, the display sometimes appears on the TV in a few seconds, other times 30 seconds, other times 120 seconds. There's no pattern to this. I usually get impatient and switch the AV receiver to a different input, then switch it back to the Mini, which sometimes causes the display to appear, although even this is inconsistent.

For a long time, I thought it was something to do with routing the HDMI signal through the AV receiver to the TV (perhaps HDCP, although the receiver supports HDCP). However, judging by the numerous reports from 2018 Mini owners with displays directly connected who also experience protracted times for the display to "wake up", it appears to be the Mini itself that is at fault.

Hopefully a firmware update is coming soon. Released almost 5 months ago, Apple are taking their sweet time to fix this frustrating problem.
 



Early days yet, but the macOS 10.14.4 update appears to have fixed the [2018 Mac Mini] video. I even get Verbose mode working now. This also explains the mystery as to why entering my password “blind” rarely worked — it’s freakin’ slow to respond, so it's basically right-arrow to pick the identity, wait three seconds, slowly type in the password, wait three seconds, hit Enter/Return, wait...

(I thought it was funny, by the way, that a competing Mac-focused web site praised the LG 34-inch 4K monitor to high heaven as the Mac monitor to get... when of course that's one of the ones that wouldn't work, until now, with a Mini!)
 


The new macOS 10.14.4 update released yesterday (25th March) includes:
  • Fixes a graphics compatibility issue that may occur on some external displays connected to a Mac mini (2018)
  • Improves the reliability of USB audio devices when used with the MacBook Air, MacBook Pro and Mac mini models introduced in 2018
I will admit I feel a little foolish for the strength of my complaints... apparently Apple did hear us! The USB audio thing was quite annoying, but I'd been assuming it was a problem with my USB hub!
Early days yet, but the macOS 10.14.4 update appears to have fixed the [2018 Mac Mini] video. I even get Verbose mode working now. This also explains the mystery as to why entering my password “blind” rarely worked — it’s freakin’ slow to respond, so it's basically right-arrow to pick the identity, wait three seconds, slowly type in the password, wait three seconds, hit Enter/Return, wait...
Oops. Earlier I reported that this fixed my problem. In fact, after leaving the computer off overnight, it still will not wake up my LG monitor. Unfortunately, it's too late for a refund on either machine.
 


Ric Ford

MacInTouch
Oops. Earlier I reported that this fixed my problem. In fact, after leaving the computer off overnight, it still will not wake up my LG monitor.
I believe that there are other problems with sleep/wake. I've encountered random (not consistent) problems waking from sleep with macOS Sierra and a 2015 MacBook Pro.

One thing you can try is disabling Sleep Image/Deep Sleep (e.g. via Disk Sensei's Optimize feature or via terminal commands) to see if that might help.

Apple also has a related support document, so you might want to try its suggestions, too:
Apple said:
If your Mac doesn't sleep or wake when expected
...
If your Mac doesn't wake when you expect
Your Mac might pause a few seconds before it wakes up. If it doesn't seem to wake at all, check for these possibilities:
  • Your screen brightness might be turned down.
  • If you're using an external display, your display might be turned off.
  • Your Mac might be in safe sleep. To wake from safe sleep, press the power button.
  • Check for a sleep indicator light, if applicable, and make sure that your Mac isn't turned off.

If the previous steps don't work
These additional steps may help identify or resolve the issue:
  • Reset the SMC.
  • Reset NVRAM.
  • Disconnect external devices other than your Apple keyboard, mouse, and display. If that resolves the issue, gradually reconnect your devices, testing each time, until you find the device that is interfering with sleep. Then check the documentation that came with the device, or contact the device manufacturer.
  • Start up in Safe Mode to see if the issue is related to non-Apple startup items, login items, or kernel extensions.
  • Try to isolate the issue by using another user account.
If you still see the issue, contact Apple Support.
 


At the beginning of the year I bought a Mac Mini. As I have for years, I backed up my Macs daily using SuperDuper. Recently, I want to check a file using the clone created by SuperDuper. I restarted the Mac and held down the option key and waited for the Startup Manager to appear. It never did. It went straight to boot on the internal Mac Mini volume. I tried resetting the SMC and erasing the drive that contained the clone and tried again. No good. Earlier, when I had another bootable volume connected, it didn't show up either. I cannot invoke the Startup Manager.

Has anyone encountered this situation? How did you solve it?
 


Ric Ford

MacInTouch
At the beginning of the year I bought a Mac Mini. As I have for years, I backed up my Macs daily using SuperDuper. Recently, I want to check a file using the clone created by SuperDuper. I restarted the Mac and held down the option key and waited for the Startup Manager to appear. It never did. It went straight to boot on the internal Mac Mini volume. I tried resetting the SMC and erasing the drive that contained the clone and tried again. No good. Earlier, when I had another bootable volume connected, it didn't show up either. I cannot invoke the Startup Manager. Has anyone encountered this situation? How did you solve it?
The 2018 Mac Mini has a new security system, based on its special T2 security processor and micro-OS. Here's an Apple support article about restrictions and overrides, including external boot:
Apple said:
About Startup Security Utility
Available only on Mac computers that have the Apple T2 Security Chip, Startup Security Utility offers three features to help secure your Mac against unauthorized access: Firmware password protection, Secure Boot, and External Boot.
...
External Boot
Use this feature to control whether your Mac can start up from an external hard drive, thumb drive, or other external media.* The default and most secure setting is ”Disallow booting from external media.” When this setting is selected, your Mac can't be made to start up from any external media.
 


The 2018 Mac Mini has a new security system, based on its special T2 security processor and micro-OS. Here's an Apple support article about restrictions and overrides, including external boot:
My trouble was that I couldn't invoke the Recovery Mode. Holding down Command-R at startup didn't bring up the Recovery screen. I was ready to reinstall the OS this morning, but I decided to give it one more try. This time I did not hold down Command-R until the Apple logo appeared, and I held it down until the Recovery screen appeared. All is fine.

Apple is to be faulted. I think that with this new security system, anyone attempting to do an Option key startup, when the default setting is on, should be presented with a message that the computer is currently on its most secure setting and must be changed to permit its operation using other volumes. For example, I had been backing up my Mini daily using SuperDuper. If the internal drive on my Mini had gone south, I would have no way to use the backed up clone. I would have to start over with three months of work lost.
 


For example, I had been backing up my Mini daily using SuperDuper. If the internal drive on my Mini had gone south, I would have no way to use the backed up clone. I would have to start over with three months of work lost.
I can't speak with certainty, but wouldn't you have been able to set up a new/repaired computer using Migration Assistant? I would think you could do an install on a new drive and then use Migration Assistant to bring back all your data (and, perhaps, settings) from the clone/backup. That is the process my son-in-law used when his old MacBook Air went south. He doesn't think he lost anything. His migration was from a Time Machine backup, but I would think the process would be the same.
 


After updating a brand-new 2018 Mac Mini from the factory macOS 10.14.3 to macOS 10.14.4, I noticed that Bluetooth was dead. The Preference Pane is gone, the System Report indicates there is no Bluetooth hardware, and all my attempts to resurrect Bluetooth have failed. I have an evening appointment tomorrow at a nearby Apple Store... will keep you posted.
 


The Apple Genii ran a full suite of diagnostic tests and were baffled at the demise of Bluetooth in this new 2018 Mini (3.2GHz i7 / 16GB / 128GB.) They offered to replace the logicboard, but said it would be weeks. I politely declined and instead will return it to Adorama for a refund and have already purchased a replacement Mini...
 


After updating a brand-new 2018 Mac Mini from the factory macOS 10.14.3 to macOS 10.14.4, I noticed that Bluetooth was dead. The Preference Pane is gone, the System Report indicates there is no Bluetooth hardware, and all my attempts to resurrect Bluetooth have failed. I have an evening appointment tomorrow at a nearby Apple Store... will keep you posted.
That sounded really familiar! I purchased my Mac Mini the first day (actually, hour) when it became available, maxed out except for the 1TB SSD and 32 gibibytes of memory. Bluetooth disappeared right after installing either the third or fourth public beta of 10.14.4. On final restart it warned me that there were no bluetooth devices available. I had to connect my keyboard and trackpad to USB to proceed. The Magic Mouse, of course, is useless when connected/charging.

About This Mac > System Report… indeed showed that there was no Bluetooth present. The Bluetooth preference icon is nonexistent in Systems Preferences. I ran hardware diagnostics, SMC reset, PRAM reset, Safe Boot, caches reset … everything that I could think of, including disconnecting all externals possible to still enable a proper boot. Finally, I got on Apple Support and opted for telephone callback. They had me do pretty much all that I tried before and even went into screen sharing. This was over a couple of days, including promoting support levels to the next tier. They finally concluded that it was an hardware issue and booked me an appointment with a local Apple Authorized Service Provider (AASP), which turned out to be a disaster. They were adamant that there was nothing wrong with the Mac because Hardware Diagnostics reported no problems. I ended up pulling the Mac and setting it up again minus bluetooth, meaning my keyboard and trackpad were connected via lightning cables.

It became obvious that I cannot do without a Mac even for a couple of days and decided to purchase a second Mac Mini as temporary replacement. I opted for the base model plus the 500GB SSD and 16 gibibytes of memory. After setting this up in place of the older Mini, I set up an appointment at my local Apple Store Genius bar. It did not take long for them to also find the hardware issue and take it in for service.

After more than a week at the Apple Store I received a call to inform me of the progress of the repair. They said that the logic board was replaced and that Bluetooth is now working. However, after running a “deep” hardware test, they found another issue related to the I/O system. They did not have the part in the store, so they ordered the part and will install and test it as soon as they have the part.

This probably makes sense, because I had been having trouble with my first Mini from the outset. I have two 4-bay Thunderbolt 3 enclosures for a total of eight drives connected. I also have two 4K monitors connected, as well as a couple of USB-C docks and a Blu-ray USB player/burner. I thought that the Mini was simply overloaded, so that a cold boot more often than not failed. I would have to turn off at least the two-drive enclosures in order to get a successful boot.

What surprised me was that the new Mini, with a slower CPU, less RAM, and smaller internal drive, boots up just fine when fully loaded. My hope is that with this last repair, that issue will be finally fixed. I shall update this post when I get the original Mac Mini back and running.
 


Interesting. (Isn't the LG 4K monitor the one that Apple is selling?) But if not, why not? And what would you recommend?
If I remember correctly, there have been problems with the display remaining asleep or powered off after the Mini wakes from sleep.

If you don't let your Mac sleep (e.g. it's on 24x7 as a server or powered off when not used), then this shouldn't be an issue. I haven't heard similar reports regarding other 4K monitors, so you can probably use any other model if you let your Mac sleep.
 


If I remember correctly, there have been problems with the display remaining asleep or powered off after the Mini wakes from sleep.

If you don't let your Mac sleep (e.g. it's on 24x7 as a server or powered off when not used), then this shouldn't be an issue. I haven't heard similar reports regarding other 4K monitors, so you can probably use any other model if you let your Mac sleep.
Some people (like me) have no sleep issues, but the monitor will not activate when you start the computer. It works if you reset PRAM first or go to Recovery mode. Oddly, this happens even if you have dual monitors and the second one works fine with the Mini (but is older and smaller).

Discussions on Apple's forums yield many people with various issues:

2018 Mac Mini - monitor problems - Apple Community
Mac Mini 2018 screen doesn't wake fro… - Apple Community
Mac Mini Display Wake Up Delay or Never - Apple Community

The monitor models listed include LG 24UD58/24UD58-B/24UD58BAEU, LG34WK95U, LG 27UK650-W, LG43UK6090PUA, and LG 27UK850 (including -W).

One person had an issue with an NEC PA271Q and another with an AlienWare AW3418DW, but other monitors seem to be fine. (Oh, yes, one more case with dual Sceptres, and a couple with Apple Cinema Displays which seem to be more likely the cables.)

The problem does not seem to affect some people if they disable FileVault.

One addition: my trusty Sceptre worked when hooked up to HDMI directly, but not when hooked up to a USB-C-to-HDMI adapter. It does work once the computer is running, but I have to reset PRAM or go into recovery mode or "did you forget your password" mode to get there.
 


Some people (like me) have no sleep issues, but the monitor will not activate when you start the computer. It works if you reset PRAM first or go to Recovery mode. Oddly, this happens even if you have dual monitors and the second one works fine with the Mini (but is older and smaller).

Discussions on Apple's forums yield many people with various issues:

2018 Mac Mini - monitor problems - Apple Community
Mac Mini 2018 screen doesn't wake fro… - Apple Community
Mac Mini Display Wake Up Delay or Never - Apple Community

The monitor models listed include LG 24UD58/24UD58-B/24UD58BAEU, LG34WK95U, LG 27UK650-W, LG43UK6090PUA, and LG 27UK850 (including -W).

One person had an issue with an NEC PA271Q and another with an AlienWare AW3418DW, but other monitors seem to be fine. (Oh, yes, one more case with dual Sceptres, and a couple with Apple Cinema Displays which seem to be more likely the cables.)

The problem does not seem to affect some people if they disable FileVault.

One addition: my trusty Sceptre worked when hooked up to HDMI directly, but not when hooked up to a USB-C-to-HDMI adapter. It does work once the computer is running, but I have to reset PRAM or go into recovery mode or "did you forget your password" mode to get there.
I use an Asus 37" monitor connected via HDMI from my 2018 Mac Mini to the monitor, and, like clockwork, I can expect to have a garbled screen - if anything at all - when waking the Mini from sleep.
 


Ric Ford

MacInTouch
I think, for most workflows, the Mini 8,1 is more than fast enough. Just don't pair it with an LG 4K monitor.
Not just LG monitors but also reports of problems with AOC, Viewsonic (VG2436), Dell (U2312HM), NEC PA271Q, Acer, HPZ30, Apple 30-inch Cinema, and Samsung monitors. Sure looks like an Apple problem to me (not an LG problem), especially considering reports that the same monitors work fine on other computers. Plus this:
Apple Communities said:
2018 Mac Mini - monitor problems
It's a known issue being investigated by Apple's engineers. No known fix at the moment.
Actually, that looks pretty well confirmed now:
Apple said:
macOS 10.14.4
Fixes a graphics compatibility issue that may occur on some external displays connected to Mac mini (2018).
You might owe LG an apology for trying to blame Apple's bug on them in so many posts...

But let us know if Apple's update actually fixes the bug for you (there seems to be some debate about its effectiveness).
 


Ric Ford

MacInTouch
Well, this confirms some suspicions I've had about Apple Thunderbolt reliability...
OWC said:
Envoy Pro EX
Mac mini (2018) Users ONLY: Bus-powered Thunderbolt 3 solutions like the Envoy Pro EX may experience intermittent disconnects when attached directly to one of the Thunderbolt 3 ports on the Mac mini. To avoid this issue, we recommend connecting your Envoy Pro EX through another wall-powered Thunderbolt 3 device in a daisy-chain. These intermittent disconnects only occur when connected directly to the Mac mini (2018) and are not seen on other computer models. This issue has been reported to Apple for resolution.
Lloyd Chambers/diglloyd said:
2018 Mac mini has Thunderbolt 3 Compatibility Issues
Readers might remember that in my review of the 2018 Mac mini I noted some display syncing issues with NEC displays. While I’m no longer having issues and 10.14.4 seems to have helped (unclear if all issues resolved for all users), it seems that Thunderbolt 3 is flawed on the 2018 Mac mini.
 


Not just LG monitors but also reports of problems with AOC, Viewsonic (VG2436), Dell (U2312HM), NEC PA271Q, Acer, HPZ30, Apple 30-inch Cinema, and Samsung monitors. Sure looks like an Apple problem to me (not an LG problem), especially considering reports that the same monitors work fine on other computers. Plus this:
Apple Communities said:
2018 Mac Mini - monitor problems
It's a known issue being investigated by Apple's engineers. No known fix at the moment.
Actually, that looks pretty well confirmed now:
Apple said:
macOS 10.14.4
Fixes a graphics compatibility issue that may occur on some external displays connected to Mac mini (2018).
You might owe LG an apology for trying to blame Apple's bug on them in so many posts... But let us know if Apple's update actually fixes the bug for you (there seems to be some debate about its effectiveness).
I've just purchased a 2018 Mac Mini (i3 model, macOS 10.14.5), and I have the 'wake from sleep' display problem with an HP 2211x monitor attached via HDMI with an Apple HDMI-DVI adapter. Rebooting via a hard reset doesn't fix the issue, but unplugging/plugging the HDMI adapter does after rebooting (which is not an acceptable solution). An SMC reset didn't fix it.

Interestingly, my monitor reports 'no signal' on the DVI line when attempting to awake. If I power-cycle the monitor with the computer awake, I'm met with static on the screen, which doesn't resolve itself unless the HDMI adapter is reconnected. So, it seems like an HDMI handshaking problem to my inexpert eye.

I've ordered a USB-C/DVI cable to see if this will provide an acceptable workaround. But still, this is disappointing from Apple.
 


I've just purchased a 2018 Mac Mini (i3 model, macOS 10.14.5), and I have the 'wake from sleep' display problem with an HP 2211x monitor attached via HDMI with an Apple HDMI-DVI adapter. Rebooting via a hard reset doesn't fix the issue, but unplugging/plugging the HDMI adapter does after rebooting (which is not an acceptable solution). An SMC reset didn't fix it.
Interestingly, my monitor reports 'no signal' on the DVI line when attempting to awake. If I power-cycle the monitor with the computer awake, I'm met with static on the screen, which doesn't resolve itself unless the HDMI adapter is reconnected. So, it seems like an HDMI handshaking problem to my inexpert eye.
I've ordered a USB-C/DVI cable to see if this will provide an acceptable workaround. But still, this is disappointing from Apple.
I had set up a few Mac Minis for clients (and one for myself) with HP's 34" 1440p display from a few years ago (don't remember the HP model number; the Minis were from around 2014, if I recall correctly). In all cases, the HDMI-HDMI connection didn't work consistently; often, the screens wouldn't "see" the video signal from the Minis at boot.

Luckily, these displays also had DisplayPort, so a cheap Mini DisplayPort-to-DisplayPort cable (from Monoprice, if I recall correctly) fixed things 100%.
 


Luckily, these displays also had DisplayPort, so a cheap Mini DisplayPort-to-DisplayPort cable (from Monoprice, if I recall correctly) fixed things 100%.
I'm limited to DVI or VGA on the HP2211x, unfortunately. I should add that the waking problem only arises after the Mac Mini (or monitor?) has been asleep for an extended period of time, such as overnight.
 


I've just purchased a 2018 Mac Mini (i3 model, macOS 10.14.5), and I have the 'wake from sleep' display problem with an HP 2211x monitor attached via HDMI with an Apple HDMI-DVI adapter. Rebooting via a hard reset doesn't fix the issue, but unplugging/plugging the HDMI adapter does after rebooting (which is not an acceptable solution). An SMC reset didn't fix it.
Interestingly, my monitor reports 'no signal' on the DVI line when attempting to awake. If I power-cycle the monitor with the computer awake, I'm met with static on the screen, which doesn't resolve itself unless the HDMI adapter is reconnected. So, it seems like an HDMI handshaking problem to my inexpert eye.
I've ordered a USB-C/DVI cable to see if this will provide an acceptable workaround. But still, this is disappointing from Apple.
I have the 2018 Mac Mini with the 3.2GHz Intel Core i7, 32 gigs of RAM, and two LG 4K monitors (LG 27UK850-W and LG 32UD60-B), one connected to a USB-C port of the Mini (by a USB-C to DisplayPort cable) and the other by DisplayPort to one of my two Akitio Thunder3 Quad X enclosures.

I routinely log out at the end of the day, and occasionally, I’d say about 10 to 15% of the time, the monitors do not come to life the next morning. Well, they do in a way, because they power up and you can hear the beeps but remain dark. Normally, after several tries, I would have to force the Mini to shut down and reboot, at which time I do get a normal startup.

Then this morning, the same thing happened. After a few tries, waking the Mac up from the keyboard, you could hear activity from the hard drives in the enclosures. So I tried going through the motion of logging in, blind, and when it seemed like I was logged in, pressed control-eject on the keyboard to invoke the shutdown/restart dialog window, pressed enter (shutdown), and sure enough, it did a shut down. I then performed an SMC reset and afterwards rebooted from the power button and everything came back up to life.

I’m wondering if the problem lies with the built-in Intel 630 graphics, and if an eGPU would help. I would not require a high-end graphics card, since the most demanding video work I do is Photoshop, and no games.
 


Ric Ford

MacInTouch
I should add that the waking problem only arises after the Mac Mini (or monitor?) has been asleep for an extended period of time, such as overnight.
I routinely log out at the end of the day, and occasionally, I’d say about 10 to 15% of the time, the monitors do not come to life the next morning. Well, they do in a way, because they power up and you can hear the beeps but remain dark. Normally, after several tries, I would have to force the Mini to shut down and reboot, at which time I do get a normal startup. ... I’m wondering if the problem lies with the built-in Intel 630 graphics...
macOS has a "deep sleep" mode that is likely involved here (across multiple macOS versions and system configurations). This is documented and controllable in Disk Sensei (Tools > Optimize > Sleep Image):
Cindori said:
Sleep Image (Default: On)
During deep sleep (hibernation), your Mac stores the RAM data onto an image file on disk. By disabling this feature, you will prevent your Mac from being able to go into deep sleep mode, but at the same time free several gigabytes of disk space.
So, one issue is that a Mac waking from deep sleep may be loading large amounts of data from storage back into RAM (as big as your RAM configuration), as well as storing that data onto storage when going back into deep sleep. My sense from trying to sort out various problems is that there may be bugs (software/hardware) in this area (as well as delays).

Of course, there may be other display bugs unrelated to deep sleep per se, and the theory of them being related to Intel integrated graphics is interesting, as those are the types of Mac systems where I've encountered them.

For what they're worth, a few Apple notes:
Apple Support said:
If your Mac doesn't sleep or wake when expected
Your Mac might pause a few seconds before it wakes up. If it doesn't seem to wake at all, check for these possibilities...
Apple Support said:
Get help with video issues on external displays connected to your Mac
Try these steps if you don't see an image on your display. These steps can also help if the image on your screen repeatedly turns on and off (flickers), if horizontal lines appear (snow), or if the image is distorted (torn or scrambled).
I don't know if Apple's tricky Power Nap feature is involved:
Apple Support said:
These problems are widespread, though:
DuckDuckGo said:
 


I don't know if Apple's tricky Power Nap feature is involved here:
My new iMac had a problem waking from sleep. The symptom was that when I tried to wake it, nothing would happen. Pressing the power button would reboot the computer.

This would happen periodically, and once it started, then every sleep would fail until I rebooted the computer. After the reboot, it would be OK for days to weeks, but then the problem would return.

I turned off Power Nap and have not seen the problem since.
 


I've just purchased a 2018 Mac Mini (i3 model, macOS 10.14.5), and I have the 'wake from sleep' display problem with an HP 2211x monitor attached via HDMI with an Apple HDMI-DVI adapter. Rebooting via a hard reset doesn't fix the issue, but unplugging/plugging the HDMI adapter does after rebooting (which is not an acceptable solution). An SMC reset didn't fix it. Interestingly, my monitor reports 'no signal' on the DVI line when attempting to awake. If I power-cycle the monitor with the computer awake, I'm met with static on the screen, which doesn't resolve itself unless the HDMI adapter is reconnected. So, it seems like an HDMI handshaking problem to my inexpert eye. I've ordered a USB-C/DVI cable to see if this will provide an acceptable workaround. But still, this is disappointing from Apple.
This bug bit me right out of the box today as I started to set up a new 2018 Mac Mini. Plugged it into a 24-inch Samsung screen via an HDMI to DVI adapter, turned it on, and nothing happened on the screen, although the tiny little light on the Mini turned on and - after a few minutes - the Mini started asking me if I wanted to set it up with voice controls. Turned that off, tried setting it up on a 27-inch Asus screen via HDMI to HDMI connection, and the same thing. I began to suspect a Dead on Arrival computer, so I called Apple Support.

We tried disconnecting everything and reconnecting to the Asus. No joy. Then we tried the HDMI to DVI connection to the Samsung (which lacks an HDMI input), and after a bit of wiggling and a gray screen, I was surprised to see the first Setup Screen. It's now taking its time importing the contents of my Time Machine backup of my 2010 Mini.

The Samsung monitor tends to black out when it times out, and has to be switched on and off and wiggled to get first to gray screen and then to display the status of the information transfer. I am taking care to avoid mucking up the transfer, but once it finishes I will fiddle around a bit more.

It looks to me like there are fiddly connections somewhere in the video circuits, because wiggling the connectors tends to change what happens, as if there is not a good tight fit between the plug and socket on all the pins in the connector. That can be a tricky problem to fix. I wonder if the connectors don't meet the specified tolerances, or the tolerances are so tight that they can't be made. It's a really annoying problem, but it's not surprising, given how small some of the connectors are, especially for iPhone and iPods.

Is there any consensus on what types of connections and monitors work best? My experience makes me think a DVI connection on the monitor works best. I wish Apple would open up about the problem; it might make it easier for Mac users to deal with it.
 



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