post code error 99 after changing to EUFI

Forsete

Reputable
Jun 20, 2015
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So I changed my boot option to UEFI instead of UEFI + Legacy, saved the canges and rebooted the PC. Now when it boots up, it just says 99 in the bottom right. I can't get into BIOS either, whenever I try to, it just says "entering setup".

My motherboard is the MSI 970A-G43 plus.

I've read that post code 99 means broken motherboard but it worked perfectly fine for years right until I changed it to UEFI only.

Anyone an idea what to do now? I've already tried removing the CMOS battery, didnt fix it.