Question What is POST Code D6 and how do I fix it?

Jul 11, 2023
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New to PC building and the forum...

Was showing a POST code 55 - pulled and reseated the RAM. Now showing a POST code d6 and can't figure this one out - internet seems to say "Initialize Option ROM Error" whatever that means.

Here are some additional details both for entertainment value and maybe some helpful context.

I built a frankenstien of a PC with my son a few years ago using free parts from someone that actually knew things about PCs. For the most part, we bought a Fractal Design case and a Corsair liquid cooling unit and the thing ran just fine for the games we wanted to play.

About 6 months ago the EVGA GTX 580 graphics card failed and had lines / low video quality - ordered a GIGABYTE GEFORCE RTX from Amazon and installed it. Didn't work. I don't remember the error codes (if any) but we had no video output. We ended up putting the old GPU in another slot so we could see video and try and figure it out. Strange thing is that the new GPU would work when the old one was also plugged in but neither would work with the old removed. So we just left the old one in and let it run figuring we'd get to it at some point.

Fast forward - the PC started shutting off almost immediately after powered on. Sometimes you'd get lucky and it would run and sometimes it would start doing that after a long time. Didn't seem to be a power and/or heat issue as we monitored that with the cooling system. But couldn't see if there were POST codes because the old GPU was sitting over the LED. I've gone ahead and removed the old GPU and figure I'll just try and get this functioning right this time.

Not sure what specs you might want to see:

Motherboard: Fatality Gaming Gear P67 Pro
Graphics Card: GIGABYTE Gefore RTX
RAM: G Skill 2x 4GB DDR3
Power: 620W
Hard Drive: Sandisk 1TB SSD

We've always known when these parts fail it will be time to replace and this is really about troubleshooting and trying to learn how to repair this kind of stuff. Any help would be appreciated.
 
I have two useable PCIE slots and have tried the the new GPU in both. It has power and did work before. What would be a fix for this?
since you have said it never worked standalone, there might be something wrong with GPU firmware (vbios), does your GPU has physical vbios switch between silent and game modes? you could also try CSM on/off in bios (if you manage to get to bios with another GPU)
 
since you have said it never worked standalone, there might be something wrong with GPU firmware (vbios), does your GPU has physical vbios switch between silent and game modes? you could also try CSM on/off in bios (if you manage to get to bios with another GPU)
I removed the new GPU and checked - no switch that I can see.

I did put the old GPU in the other PCIE slot and I'm back to where I started now. The new one will output to the monitor so long as the old one is in the other PCIE slot even when its not powered or has any cables attached.

Doesn't appear there is anything CSM related in the BIOS. I'd be willing to bet this motherboard is 10+ years old if that makes a difference.