Build troubleshoot

[Evolving Noob]

I just finished putting my old computer together. It worked fine before. Now was soon as i give the system power all the fans start turning but the MB sends no signals (no beep, no screen signal, no power/HDD lights). I've gone through that everything is plugged right, tried disconnecting all the drives, still no signals. Anyone know what is going on. the MB/CPU dead or something?
Thanks for your replies!

[Tedster]

What PSU are you using?

[TheGhzGuy]

It might be the PSU, bent CPU pin, dead mobo/processor or a combo of them. System specs/ Which PSU?

[johngo90]

Try a battery pull on the mobo. 

[Evolving Noob]

Sorry, system specs:
MB: MSI Z77A-G43
PSU; Corsair HX650W Professional Series
CPU: Intel i5 3790k
RAM: Corsair DDR3 8gb
Gonna try battery pull tomorrow, pissdrunk hosting a party right now. Cheers guys, thank you so much for your help!

[Evolving Noob]

Try a battery pull on the mobo. 

Didn't work Still the same, as soon as the system gets power everything starts up but no signals. Going to try a different PSU tomorrow.