Computer shuts down by itself after a short while

Spinechill

Honorable
Nov 10, 2013
2
0
10,510
I've just gotten a geforce gtx 760, and after installing, my computer shuts down. I've got a 750watt power supply and a boatload of RAM. I've also got an i7 processor.
Please help, I have no idea what's going on.
 

Spinechill

Honorable
Nov 10, 2013
2
0
10,510

After I replaced my old card, I started the computer as normal. It started windows 7 and I installed the newest driver. After a while, I was starting up steam to try it out. That's when the computer just shut down.
The temps are:
Current system temp: 29° C
Current CPU temp: 42° C
All fans are running.
Vcore: 1.268V
DDR15V: 1.584V
+5V: 5.080V
+12V: 12.365V