Black screen and stuck reboot with eGPU solved in 10.15.4
 
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Black screen and stuck reboot with eGPU solved in 10.15.4  

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(@massimo_franzese)
Trusted Member
Joined: 4 months ago
 

In 10.15.3 I could boot ok but reboot would get stuck now all is working fine though no Apple to be seen

Mac Mini 2018 3.2 Ghz 6 cores
Razer Core X enclosure with Sapphire Vega 64 Nitro
Benq PD2720U


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(@erik_holmstrom)
Active Member
Joined: 4 months ago
 

I updated to 10.15.4 and can not boot without getting the black screen. I still have to boot up CPU and then after 20 seconds power up the eGPU. After upgrading to 10.15.4 I am also getting some screen flickering as well. 

2018 Mac Mini (6-core i7)

RX 5700 in Sonnet Breakaway Box

 

This post was modified 2 days ago

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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rnb2
 rnb2
(@rnb2)
Eminent Member
Joined: 1 year ago
 

With the caveat that I (once again) forgot to unplug my eGPU while updating - not sure if that is part of my issue - I can cold boot with 10.15.4 without having both an HDMI cable from my mini to my display and my eGPU connected. No Apple logo, but it also doesn't hang without ever getting to a login screen. This probably still doesn't really help if I want to boot to Windows, as the lack of a logo screen probably means I also wouldn't get a boot device screen if I tried it.

Restarting the mini still hangs without HDMI, regardless - no login screen ever appears. Wish I would have remembered to unplug the eGPU during the update, just to know whether that is still causing mischief.

2018 i7 Mac mini - OWC Mercury Helios FX (Sonnet 550) - ASRock Vega 56 - BenQ SW271


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(@massimo_franzese)
Trusted Member
Joined: 4 months ago
 

@rnb2,

Yes you need to update with the eGPU disconnected or you are back where you started 

I can confirm I updated with the thunderbolt connection and eGPU off and now it works totally fine for start and reboot

 

Mac Mini 2018 3.2 Ghz 6 cores
Razer Core X enclosure with Sapphire Vega 64 Nitro
Benq PD2720U


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Mini i5
(@mini-i5)
Reputable Member
Joined: 7 months ago
 

@rnb2

Restarting in 15.4 goes smoothly with only my eGPU connected. 

 

2018 Mac Mini i5 / 6-core 3.0-4.1 Ghz / 32GB / 256GB / Intel UHD 630 / PowerColor Gaming Station / PowerColor dual-fan RX5700 XT / Mac OS 10.15.3 Catalina / LG 27" 4K display


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rnb2
 rnb2
(@rnb2)
Eminent Member
Joined: 1 year ago
 

@massimo_franzese, Any idea if downloading the combo updater (assuming that's still possible) and running that with the eGPU disconnected might fix that?

 

2018 i7 Mac mini - OWC Mercury Helios FX (Sonnet 550) - ASRock Vega 56 - BenQ SW271


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(@massimo_franzese)
Trusted Member
Joined: 4 months ago
 

@rnb2, No idea

 

Since 10.15.2 I am being very careful with updates. I even did a clean reinstall once you may try that

 

Mac Mini 2018 3.2 Ghz 6 cores
Razer Core X enclosure with Sapphire Vega 64 Nitro
Benq PD2720U


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rnb2
 rnb2
(@rnb2)
Eminent Member
Joined: 1 year ago
 

I tried with the combo update (they're available from https://support.apple.com/downloads/macos) and the eGPU powered off, but still end up with the black screen about half the time when cold booting without HDMI plugged in, and still can't get it to restart without hanging at the black screen. Since the Apple logo never appears via the eGPU, even when it finishes booting correctly, this probably isn't a big help, since it probably means that the option key boot menu won't appear either, so I'd still need to have HDMI plugged in for that. Maybe in 10.16 this will all get resolved?

2018 i7 Mac mini - OWC Mercury Helios FX (Sonnet 550) - ASRock Vega 56 - BenQ SW271


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