New Graphics Card, but shuts down... Help!

RtR_Instinct

Commendable
Jun 18, 2016
3
0
1,510
I have just bought a new graphics card and a new power supply for my 3 year old computer. After installing both, the PC would boot up normally. But after playing a game for a while the area around my PC would heat up a lot and the monitors would shut off making me have to do a manual reboot. BUT the temperature stays at 51 degrees Celsius. Right after the monitors go black the fans stop. The graphics card light turns on so what could be the problem, the motherboard or the graphics card or something else? Thanks in advance!

My computer specs:
Cybertron XPredatorX1 Helion
Motherboard: Gigabyte GA-78LMT
CPU: AMD FX-6300
RAM: 16GB
GPU (old): NVIDIA GT640
GPU (new): GTX970 ASUS
PSU (old): 400w
PSU (new): Corsair RM750i
 

RtR_Instinct

Commendable
Jun 18, 2016
3
0
1,510


The monitors goes into sleep mode. By tempature I mean the GPU temparure