2018 Mac Mini with eGPU not booting back into macOS from Windows Bootcamp
I have a 2018 Mac Mini i5 (6-core) and a Razer Core X Chroma with an RX 590 Fatboy gpu. I got this setup because I had an old tower that I was able to sell to buy the gpu and egpu enclosure to game with.
I installed Windows using Bootcamp but I am running into this weird issue when trying to boot back into macOS from Windows. The Mac Mini just turns off and then when I hit the power button there is no video signal until I unplug the egpu and plug the hdmi into the Mac Mini.
Any ideas what is happening and how to fix it?
Run the Mac OS 10.15.5 update. (With your eGPU and other TB3 devices disconnected).
Also, the first time you re-boot from Windows back into Mac OS, first eject and unplug any TB3 or USB SSD you have attached to the Mini.
It should boot back into 10.15.5 fine the first time with only the eGPU attached.
Going forward from there, attached drives shouldn’t cause any issues.
Next time you finish a Windows session, be sure to disconnect any external drives before re-starting in Mac OS.
Catalina should start-up with only the EGPU connected via TB3.
When Catalina is up and running, attach any external drives you have. Catalina will recognize them and they'll appear on your desktop.
You should be good from that point. Catalina should "remember" those external drives the next re-start into Mac OS from windows.
(Unless your drives are formatted for Windows only and can't be read by Mac OS. In which case, you might have to detach them, or power them off)
Thank you for the advice.
I disconnected my Akitio SK-2520 U3.1 SCSI Disk Device and the boot to windows and back to MacOS 10.15.5 works perfect. The famous black screen whilst changing from Windows 2004 to Catalina is gone. Bevor the disconnect, the boot-up to Windows took, with attached PowerColor Mini Pro and the Akitio SK-2520 57 sec, now, only with the eGPU attached, 24 sec - perfect. However, shame on me that I was not aware that the Akitio SK-2520 interface is only USB 3.1 and not TB3.