Hi i recently bought a used pc that had random restarts as I thought I could fix it. System is a asus sabertooth 990 fx mb, amd fx 4170 with a Arctic cooler 7 pro rev 2 temp for cpu is 40 degrees was running windows 8 also a corsair 550vx psu. I added a gtx 660 cu gpu and a new sandisk ssd with a new install of windows 7 and 2gb of ram just to install everything and add more ram later also i reset the cmos everything was running fine 134 updates was installed then the restarts started to happen any help thanks.