C5 code on B650D4U

Dai wrote: I just picked up a B650D4U to build a server with. When I turn it on, it doesn't fully POST. Looking at the Dr. Debug codes, I see 15 followered by C5 where it stops. Never get VGA output though it'll take the display out of low power mode, nothing ever comes up just black screen. The manual doesn't list C5, but says 15 is something like northbridge init.

C5 often seems to point toward a memory initialization or training issue, even if it's not clearly documented in the manual. I'd try booting with a single DIMM in the recommended slot, reseating both the CPU and memory, and, if possible, updating the BIOS using the board's flash feature before assuming there's a hardware fault.

It would also help to know which CPU and RAM kit you're using, since some early BIOS versions had compatibility issues with certain DDR5 modules.


Edited by Xaltar - 35 minutes ago at 4:59am