Black Screen Startup Issues Mac Mini
i have the same problem and the Apple support could not help me 🙁 I own a Mac mini 2020 including 32 GB. For this I have connected an eGPU Razer Core X with a Radeon RX 570 with 8GB. Unfortunately I also get a black screen when I connect all screens to the eGPU and make a Reboot or boot. Only when I connect a screen via the direct HDMI connection to the Mac mini do I get the login screen when booting.
Does anyone have a solution?
Are the card and enclosure working?
Yes, all screens connected to the eGPU will work during operation. The eGPU icon can be seen at the top of the bar. Only when restarting or booting up will both screens remain blank.
Because all screens stay black, I had to reconnect one directly to the Mac mini.
i have a update.
I have some problems with 10.15.7. So I reinstalled the complete machine and played back my Time Machine backup. Since then I can only use my two screens via the eGPU 🙂 When booting I don't see the Apple logo, but after that the login screen ! crazy!
The below suggestion is by no means a good one, but it works and can be used (atleast until Apple fixes this mess)
- Mac Mini 2018
- macOS Catalina - 10.15.7
- Razer Core X + Radeon RX Vega 64 8 GB
- 2 External Monitors connected to the RX Vega (1 Monitor on HDMI port and the 2nd Monitor on the Display Port of the RX Vega 64 )
- (I dont have any External Monitor connected directly to the Mac Mini 's HDMI/Internal Graphics)
You will need to first figure out how long it takes for your Mac Mini to reach the login screen on boot (Example : 40 seconds)
- Now Turn off the Razer Core X (power switch on the back of the enclosure)
- Start up your Mac Mini (power button on the back of the Mini)
- Patiently "wait" for the time it takes for your Mac Mini to boot (Example : 40 seconds). Your displays will still be dark
- Assuming you have reached your login screen (yeah, the external monitor displays would still be blank)
- Key in your password. Hit enter
- Turn on your Razer Core X (power switch on the back of enclosure)
If all goes well you will now be greeted with the macOS desktop on your external monitor(s) from eGPU
This workaround certainly takes some time getting used to, but I've been able to use this ever since the Catalina update that broke eGPU on the Mac Mini .