No input on screen after replacing PSU

[JeroenBeunckens]

A week ago my PSU randomly died on me and I ordered a new one (more W, same config). Today I replaced it, I didn't use any guide I just made sure my GPU was using the PCI ports and the rest I Just plugged in wich hole was possible (modular PSU). I got message that my screen wouldn't show, after wiggleing the PCI cables on the GPU it started up and I thought I fixed it. I played some games and encountered no problems. After shutting down my PC I immediatly rebooted it because I forgot to do something and it gave me the same problem of not showing a screen again. Was the wiggleing coincidence or what am I supposed to do?

I have read allot of articles about this but haven't found my answer.

Thanks for your help.

 

[JeroenBeunckens]

May be deleted, asked twice by accident.