Computer rebooting every 5 seconds: possible Motherboard issue

sacredhero

Honorable
Jan 30, 2014
2
0
10,510
I'll try to keep this short. My homebuilt pc (3 years old) was working fine earlier today. Put it to sleep and came back four hours later.

I turned the computer on and it started up but shut down after about five seconds. Without touching anything, it immediately tried booting up again but shut down after five seconds. It will continually boot up then shut down until I manually hold down the power button to force shutdown. The computer is not on long enough to get to the bios screen.

I have an asrock p67 extreme4 mb. There is a debug window that shows error 55 (memory not installed) while the computer is temporarily on. I have tried taking out the ram (2x4 gb) and replacing them into every possible arrangement (including only using 1), still same issue.
I have reset the cmos as well, still same problem.
Furthermore, I have checked the cpu to see if all of the pins are straight, no issue there.

So far I have no idea what else to do. At this point it could easily be my psu, mb, memory, or processor.

Other than sending all the parts back to get them checked out, is there anything else I can do?

Specs:
P67 extreme4
I-5 2500k
TX 750 Corsair psu
2x4 corsair vengeance ram