Computer wont boot up

nrassoules

Honorable
Nov 3, 2012
1
0
10,510
I have a new build pc with:
Asrock 970extreme3
Nvidia GTX 550ti
8gb crucial ballistix sport 1333
WD caviar black 500gb HDD
AMD Phenom ii x4 965 black edition
haf 912 case
ocz 600w modxstream pro PSU

I have had this for about 3 months now and I had recently had a PSU shortage and gotten another one and now my computer wont boot up all the fans are working and i hear a success beep but my monitor recieves no signal. I had bought 2 550ti's one for my friend and I still have it so i tried that but it still gave my monitor no signal. I HAVE TRIED EVERTHING.... reseating ram, different monitor, new cables, reseating the processor, trying to reset the bios from the keyboard and none of these worked. Im very frustrated by people telling me the same thing please I need help anymore suggestions???