The computer started hanging then the graphics began to freeze. The only way to get the screen to work correctly was to boot in "safe" mode. I tried to run diagnostics in safe mode but it didn't help. Now the system won't book up at all. When I turn it on, the hard drive runs for a couple second and then it just sits there. I tried hooking up an external monitor to verify the screen wasn't the issue and the monitor did the same thing.
My thoughts are either the motherboard or the video card. My gut is saying the motherboard. If so, I know it's probably just as easy to replace the computer as to replace the motherboard but before I try to make the decision, I want to be able to verify the problem.