What size power supply do I need?

aprentic

Honorable
Jan 9, 2013
5
0
10,510
I have just built a new desktop with a zotac 650 ti graphics card. After being built the PC boots up but no signal is received to my tv/monitor. I have read previous threads that suggest the power supply is the problem. I was curious as to how big a power supply I needed. Right now I have a corsair cx750. All the fans run but they seem like they may be a little weak. I'm running a couple 200mm fans and a 140mm fan. I also have an AMD quad processor

Your help would be greatly appreciated.
 

aprentic

Honorable
Jan 9, 2013
5
0
10,510
Ok so i tried the gpu in another rig and everything worked perfectly fine. Is everyone sure that the power supply might not be at fault? i get no beep on start up