Computer boots for half a second, then dies

cheezy12321

Honorable
Oct 28, 2012
12
0
10,510
My computer was working mostly fine (some overheating during games) so I decided to take it apart and reapply the thermal grease and do some cleaning. I ended up doing some cable management in addition to reinstalling the CPU cooler.

Now when I try and boot it up, the fans spin for half a second, then it shuts off. I'm not getting any sort of motherboard beeps or anything like that. I thought this was a grounding problem - maybe the standoff pins weren't correctly screwed in? So after redoing that I tried something else.

I have the motherboard propped up by rubber, supported where the pins are screwed in. The mobo is sitting on a wooden table and has the CPU (but not cooler), memory, power button cords, and PSU to motherboard power plugged in. I'm still getting the same problem. And I've tried it both with and without the memory in.

What isn't working? The motherboard, the CPU, the power supply, or my brain?
 
Breadboard the m/b outside the case. Set it on the box it came in, or on another non-conductive material. Hook up psu, cpu, cpu cooler,boot drive and one stick of ram. Make sure you have the piezo speaker attached to the m/b, then boot. Note any beep codes. Use on board graphics to begin.

Mark
 

cheezy12321

Honorable
Oct 28, 2012
12
0
10,510
I get a single short beep as it shuts off, which I'm guessing isn't that helpful. Right now I think the motherboard is the problem and that I should be looking for a new one.

EDIT: Oh, and it's a gigabyte motherboard.