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OC Big Sur black screen / nvme issues

Joined
Jan 31, 2019
Messages
45
Motherboard
MSI Z370 Gaming Plus
CPU
i5-8500
Graphics
UHD 630
Mac
  1. MacBook Air
  2. MacBook Pro
Classic Mac
  1. PowerBook
Mobile Phone
  1. Android
  2. iOS
My Open Core Big Sur installation goes black for a few seconds to a minute after at the login screen, then okay. So does my Clover Catalina on a separate drive on same machine.

I did actually get a boot up when it didn't do that - after changing the AAPL,ig-platform-id from 07009B3E to 00009B3E, but now it's come back.

Also, I did the Big Sur installation direct to an fresh NVME SSD — wd sn550. On western Digitals website, they quote my 250gb model as up to 2400 read... but I'm getting in the 800s on Blackmagic, and in the 900s on AmorphousDiskMark.

Any ideas??

Thanks
 
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