New PSU, paper clip test?

[iliveeee]

I recently upgraded my psu. After connecting everything, my computer showed no sign of power when attempting to turn on. I unplugged the motherboard power connector and used the adapter that came with the PSU to test if there was something wrong with the PSU. I left everything else connected, and it everything powered up. When I plug it back in to the motherboard, nothing happens. Does this means there's definitely something wrong with the motherboard power connector, or could something else be preventing the computer from starting up?

 

[Vic 40]

Can you test it with someone elses pc? Doesn't need to be built inside,just put it on the closed side (fan on top) next to the other pc and connect the motherboard connectors (+maybe the pcie if necessary) and see if you can get into the bios.

 

[g-unit1111]

What PSU did you have and what PSU did you upgrade to?