The other day my Threadripper system would not wake up from sleep. I turned the computer off via the power button (4sec). The computer refused to boot and gave me a post code related to ram, so I resat the bios and the computer came back to life. I activated the EXPO and PBO and the computer booted fine into windows. After the next shutdown the computer refused to boot again, giving me a post code error “90” or maybe its “9D”. I tried to reset the bios - To no help, I pulled the memory - to no help. The post code stops at “90” and nothing more happens.
After reading some other forum post with similar issues, it seems it might be the CPU. Is it a problem to RMA it when you have activated the PBO function?
Or do anyone have any clues to what could be the issue? or a fix.
The system is 1 1/2 month old and have been working flawlessly up to this point. Its a Rev. 1.2 board installed with the latest bios (did update the bios when I builded the system)
Have you tried unplugging it from the wall for 5-10 minutes and then plugging it back in and seeing if it will boot (without a CMOS reset)?
My thought is it could be the PSU SB rail silently tripping and remaining messed up as long as the PSU has power causing the weirdness, removing power and letting the PSU discharge could probably reset this problem (assuming the problem even exists).
I tried to reseat the cpu, and the computer boots normal again. Kinda strange since I didn’t move or otherwise tinker with the computer. Im still running at stock ram speed, will do some test later with EXPO. I will be writing a follow up in a couple of days.