new computer, doesnt show anything on the screen.

Fredrik90

Honorable
Dec 4, 2013
19
0
10,510
I've just built a computer but whenever i hit the start button it starts up and immediately restarts itself but nothing is shown on the screen.
What can the problem be?.
Btw, i've tried another power supply.
Specs:
processor intel i7 4820k.
Graphic card gtx 780.
Ram : Corsair XMS3 Vengeance 16gbit
Powersupply antec 900w.
Motherboard Asus p9x79 ws