video just went out on me the other day , figured card was bad so i got a new one. It worked great for 20 minutes then windows just shut down out of nowhere and now im back to having no video at all
It could be your PSU, maybe its going bad. What brand and how many watts is it? As well as the specs of the rest of your system just in case.
+1 to posting the complete system specs. In addition to a possible PSU problem the issue could also be a dead/dying stick of RAM. Have you tried booting with each stick of RAM by itself? Here's a checklist to help with troubleshooting: