Q-code "00" out of the blue

Apr 24, 2018
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For six years my computer has worked flawlessly, but a few weeks ago, out of the blue, it wouldn’t boot up. My motherboard indicates the Q-code “00" and the CPU red light is on.

After three weeks of troubleshooting and reading every relevant post on this forum, I am in desperate need of help.

My components:

ASUS P9X79 Deluxe
i7-3930K
32GB Samsung ddr3l RAM
Corsair AX750
Noctua NH-D14
GTX 550Ti

Fortunately, I have two other very similar builds which I was able to test each individual component with. The CPU, RAM, graphics card, fan, and PSU all worked with the other computers, so I assume it’s the motherboard. I contacted ASUS, but that nightmarish ordeal would require another thread to describe. Long story short—they provided no help at all.

This is what I’ve tried:

Updating BIOS
Breadboarding
Inspecting capacitors for signs of damage
clearing CMOS

A temporary solution seems to be simply unplugging the PSU and waiting a few hours. It consistently boots up normally after that, but then repeats the problem upon either shutting down or restarting. I thought it might be the CMOS battery, so I replaced it, but the problem persists.

I don’t know if it’s an electrical short or what, but at this point, I am convinced repairing it is beyond my skill. If anyone has experienced this before, or has an idea I haven’t thought of, I would greatly appreciate it.

Thank you
 
Apr 24, 2018
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Yeah, the graphics card is currently installed in the second x16 slot. It still indicates Q-code "00" randomly upon restart, but it doesn't do it as frequently as when it was installed in the first x16 slot.

But even with no graphics card installed--just CPU, heatsink, and 1 stick of RAM, it was doing it too.

Thanks for your reply.
 
Apr 24, 2018
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I assume it's the motherboard. I thought about taking it to a computer repair store, but I figured the cost to diagnose it and repair or replace would be a poor investment with no guarantee.

My computers are used for music production, so it was probably time for an upgrade anyway. Since this happened, I bought the components for an 8700k build. I would've done it A LOT sooner if I could've reused my Samsung ddr3l RAM--it's SO good. I was floored at how expensive RAM currently is.