Computer does not power on - PSU is fine

[visionviper]

I am moving an older Athlon 64 system to a new case and now it refuses to power on. I tested a second power supply with the system to see if it was a bad PSU, but I still have the same problem. When I hit the power button everything lights up and starts but only for a split second. Any ideas on what the problem is?

 

[gregnash]

Seems like you may be grounding out somewhere. Make sure that everything is seated properly and retry it.. if not make sure that you dont have any odd metal touching the board as well as the case

 

[visionviper]

How would I check to find out where I am getting grounded? Just disconnect random components to see which one is the cause?

 

[ashmedai]

a new case and now it refuses to power on

If you see that, the first step is to take the parts out of the case, set them on something nonconductive (motherboard box, desk, whatever...I get a little sloppy with that step usually) and see if it will boot if it's not in the case.

If you're feeling lazy, make sure everything's properly seated and connected first...

 

[visionviper]

When I take the motherboard and PSU out of the case, everything boots up fine. My guess it that the motherboard is the component grounding out. What should I do?

 

[visionviper]

I redid the standoffs and its all fixed now. Thanks to everyone for their help!