My pc reboots when playing World of Warcraft

Gustav Emil Linde

Honorable
Jan 15, 2014
2
0
10,510
hey tom's hardware
I have a problem : (
here a while ago I bought a new graphics card a (AMD Randeon HD 7800seires ) because I have an HP computer the hardware Placed a little diffrent inside the PC. so I had to run to a professional to put it into the PC. when I got home and had to try out my new graphics card . I Opened World of Warcraft and played in 2 Hours and I turned off my PC without no problems . the next day in my pc started agian and when i started moving inside the game my PC just reboots (no blue screen no warning ) . I thought it was just a bug in the system or something, but it did it again. after a lot of research. found in it for me might be overheating . I opened my PC 's case and would cool it down a bit. it still reebotots . : ? ? ? . in tryed to install the grapich driver again but the same thing happened. in reinstalled windows 7 agian ? but it still not works . but just in tryed to play GTA san andreas and then a mystic thing happends ? there was no reboot ? uhh ; D
what is the usse ?to the computer world. so i