My computer overheated a while ago
and it has been having one problem after another ever sense. Most recently when playing Civ4, my screen will go black and then turn back on after a few seconds. It will remain on for about a second before going black again. If I minimize the game I will see an icon at the bottom right hand side of the taskbar that looks like an orange triangle. If I hover my cursor over it, a message will pop up that says something along the lines of "the graphics something has failed and recovered". Any ideas about what is wrong with my computer or how to fix this? Thanks 

