Computer starting up and shutting off constantly

[weded]

My computer was working a few hours ago, we moved it now it is no longer working. We press the button and the lights for the fan turn on, and the fans start spinning for a few seconds then it turns off, and attempts to boot up a few seconds later. I unplugged my psu and started testing it by adding one thing at a time, it works fine with everything, but if I plug in the 8pin connected on my motherboard it then starts this problem.

It was working fine before, and this is a new problem, any ideas in how I could resolve this?

 

[gussrtk]

just sounds like a bad psu....

 

[weded]

The psu is working, as it in it starts up without anything plugged in, and works with everything but the 2x 4pin connectors plugged in.

 

[gussrtk]

try another psu... honestly that is a pretty good sign at psu... so try another easiest way to test... and ya i know that it can have power here and there.. but it must have certain ratings on each connector

 

[weded]

Ok, I tested a different powersupply that I know works and it was having the exact same problem, so it's obviously not a psu problem. Any other ideas on howwe could diagnose or fix this problem?