I am having a problem with my computer. Sometimes it randomly freezes and everything locks up like my keyboard and mouse. I completly reinstalled Windows Xp to see if that would fix the problem but it did not. I checked for viruses and spyware but there weren't any. I also have a firewall. So I don't think it is software related problem. Sometimes when I restart my computer when it freezes the monitor has no power I see a yellow light and not the green light on the monitor. I think the problem is my graphics card. Can someone tell me if im wrong?