Black Screen Startup Issues Mac Mini
 
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Black Screen Startup Issues Mac Mini  

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ikir
 ikir
(@ikir)
Prominent Member
Joined: 4 years ago
 

Give Apple feedback, this is a widespread issue. Workarounds are nice but Apple needs to fix this.


MacBook Pro 2018 Touch Bar i7 quad-core 2.7Ghz - 16GB RAM - 512GB PCIe SSD
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my Mantiz Venus extreme mod with Sapphire Nitro+ RX Vega 64

 
2018 13" MacBook Pro [8th,4C,U] + Radeon VII @ 32Gbps-TB3 (Mantiz Venus) + macOS 10.15 [build link]  


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mac_editor
(@mac_editor)
Famed Member Moderator
Joined: 3 years ago
 

Can’t believe this issue is still around - wtf is Apple doing. Wish I had a mini + time on hand to debug. 

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2014 15-inch MacBook Pro 750M
2018 15-inch MacBook Pro

 
2019 13" MacBook Pro [8th,4C,U] + RX Vega 64 @ 32Gbps-TB3 (Mantiz Venus) + macOS 10.14.6 & Win10 [build link]  


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DaveSignal
(@davesignal)
Active Member
Joined: 2 months ago
 

I just sent Apple feedback, explaining that the Mac mini doesn't boot and that I have a workaround for it.   I briefly explained the workaround and stated that users should not have to use a workaround in order to use their computers.   They should fix it.

My mac mini does auto login for my user account (I am the only user).   Without the workaround, it gets stuck on boot most of the time if only eGPU monitors are present. ie: It is not stuck at a login prompt.   It just doesn't finish the boot process, it is just a black screen with no beep from BIOS. If users have been having this issue for multiple MacOS releases however, I somehow don't think it is a high priority.   At least, I would bet that it's a security thing not to enable the thunderbolt ports until a certain point in the boot routine.   But the boot routine doesn't get to the point where the ports are enabled because it hangs when it cannot reach the monitors.

This really only affects Mac mini users.   And it is especially difficult if the mac mini and eGPU are not in a location where the rear ports are easily accessible (user needs to disconnect/reconnect for every restart).   But. at least the workaround I posted above solves this issue for users who just want something that doesn't need to be touched.  It can be used until Apple decides to fix the underlying issue.

This post was modified 2 months ago

Mac Mini 2018: i7, 16GB RAM
Razer Core X
Radeon RX580 - drives 2 monitors


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sdedalus1
(@sdedalus1)
Eminent Member
Joined: 3 years ago
 

@itsage Please add a warning to the eGPU Boot Camp Setup Guide on the main page: it still recommends the Mini in glowing terms, but new users are likely to hit a brick wall with the black screen and not be able to proceed.

2018 Mac Mini (8th,4C,B) + RX 580 @ 16Gbps-TB2 (AKiTiO Thunder2) + macOS 10.14.6 & Win10 1903 // Win10 on external SSD (build link)

 
2014 13" MacBook Pro [4th,2C,U] + RX 580 @ 16Gbps-TB2 (AKiTiO Thunder2) + macOS 10.13.6 & Win10 1903 [build link]  


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itsage
(@itsage)
Illustrious Member Admin
Joined: 4 years ago
 

@sdedalus1, It's hard to make a one sentence statement on something as convoluted as eGPU Boot Camp setting for any particular Mac. I'm far from an Apple apologist. I am a big fan of headless Macs and would like Apple continuing making them, especially the affordable ones. There is no other computer with a capable CPU, iGPU-only, and two CPU-connected Thunderbolt 3 controllers. It's not perfect but Apple has made firmware changes to provide Boot Screen support to the eGPU. The challenge is that there are too many different graphics cards to QA. Let's not forget Apple rarely ever support third-party hardware upgrades in the same way eGPU users have enjoyed.

 

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2020 13" MacBook Pro [10th,4C,G] + RTX 2080 Ti @ 32Gbps-TB3 (AORUS Gaming Box) + Win10 2004 [build link]  


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DaveSignal
(@davesignal)
Active Member
Joined: 2 months ago
 

I haven't had much time to test it, but did install 10.15.5 beta 4 today.    I made sure I only had eGPU monitors connected and did a reboot to test.   It worked perfectly.   So it looks like next GA release will fix for everyone, as long as Apple doesn't break it again.

Mac Mini 2018: i7, 16GB RAM
Razer Core X
Radeon RX580 - drives 2 monitors


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ScarthMoonblane
(@scarthmoonblane)
New Member
Joined: 2 months ago
 

@davesignal, according to Sonnet Apple has addressed the issue in a bug report and is working on a fix now. You may be right that the next update may fix the problem. Fingers crossed.

 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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DaveSignal
(@davesignal)
Active Member
Joined: 2 months ago
 

I may have spoken too soon.   I did do a 2nd restart since the first time and this time it didn't work without any workarounds. 

 

EDIT:  Nevermind.  I think the issue I stated above may have been due to a different accessory I was trying to configure.  I have since done 3 or 4 restarts since I made the above comment.  And all have worked perfectly.   So 10.15.5 may in fact be working.  It is far more reliable than 10.15.4

This post was modified 2 months ago

Mac Mini 2018: i7, 16GB RAM
Razer Core X
Radeon RX580 - drives 2 monitors


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Santiago Rodríguez Pozo
(@santiago_rodriguez_pozo)
New Member
Joined: 1 month ago
 

@davesignal, How is your experience with 10.5.5-beta? Is it working good for you?

 

Mac Mini 2018
Razer Core X
AMD RX 5700 XT


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Santiago Rodríguez Pozo
(@santiago_rodriguez_pozo)
New Member
Joined: 1 month ago
 

I went ahead and installed 10.15.5-beta and the problem persists... so not being solved at the moment.

Mac Mini 2018
Razer Core X
AMD RX 5700 XT


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