Hi, I am going crazy. All of a sudden my screen will flash black for several minutes then go totally black, and I have to reboot. This mainly happens when I try to play a video or Everquest. Seems like the system can't handle heavy visuals for some reason. I have a Dell Dimension DM 4600, Intel Pentium 4cpu, Windows XP, NVidia GeForce FX 5200. I have spent days talking to Dell Techs, but the guys in India really haven't a clue. I have reset my computer to a prior date, uninstalled NVidia drivers and reinstalled from original disk, etc. and nothing helps. Any ideas?