Black screen in games

U might have seen my reports of my crashes before on this forum each time I think I fix but it comes back. I get a black screen but no auto restart in games after 30 minutes to 2 hours of play. I could let it sit on the black screen forever. The computer still runs but its just black. I have to restart (hold pwr button for 6 seconds) the pc to get it to function. Their is no windows has recovered from an unexpected shutdown pop up on reboot. In the event viewer their is nothing about amd northbridge Like in the past when this happened the only error is kernal power 41 system was unexpectatdly shut down(this is in the event viewer no pop up). Thier is no whea logger message or anything. Also i replaced my mobo and ram which was when the amd northbridge errors stopped. It still is an amd board to. Just the only error is kernal power 41. Pwhh that was alot.


Thanks,
if you need anymore info I will try to post it

bump... eep.