Pc wont Power on

[simon0frantisek]

Hello. So i just installed new cpu, motherboard and ram.. and my Pc just wont turn on.. i really dont know what is the problem.. my Guess is that my Power supply IS older, but IT IS 750W and i had no truble before.. do u have any tips what might be the problem ?

 

[Supahos]

What are all your parts? Does it do anything when you hit the power button? Have you tried building it outside of the case and shorting the pwr sw pins with a screwdriver?