[SOLVED] GPU won't post w/ CSM Disabled

[walkthewalk]

Looking to upgrade to Win 11, and need to enable secure boot. When I enable secure boot in my BIOS, it turns off CSM, which causes my GPU not to post. Had to pop out the battery on the MB to clear CMOS to get my PC booted back up. Does anyone know how to GPU to post with CSM turned off?

GPU: RX 580 - Sapphire Radeon Pulse 4GB
MB: GIGABYTE Z390 AORUS PRO Wi-Fi

 

[Koekieezz]

I ever experience this kind of problem, it was when i turn my sata mode to AHCI from IDE and boot to UEFI from Legacy.

For me, the solution is clean install windows with csm off, also convert the drive into a gpt partition if its not gpt yet.

 

[Third-Eye]

Looking to upgrade to Win 11, and need to enable secure boot. When I enable secure boot in my BIOS, it turns off CSM, which causes my GPU not to post. Had to pop out the battery on the MB to clear CMOS to get my PC booted back up. Does anyone know how to GPU to post with CSM turned off?

GPU: RX 580 - Sapphire Radeon Pulse 4GB
MB: GIGABYTE Z390 AORUS PRO Wi-Fi

There are ways to fix your issue, but the easiest that will cause the least trouble in the future, is to get a new SSD to start over with a properly GPT activated and partitioned SSD with secure boot enabled and CSM disabled so only UEFI boot will work.

 

[walkthewalk]

There are ways to fix your issue, but the easiest that will cause the least trouble in the future, is to get a new SSD to start over with a properly GPT activated and partitioned SSD with secure boot enabled and CSM disabled so only UEFI boot will work.

It actually does not even get to the point of booting up the operating system. It fails to post the GPU at all. The "VGA" status LED lights up.