Lately when I have been playing games for anywhere from as little as 5min to a long as 6 hrs (FS2004, AAO, UT2k4, DFBHD) my monitor will go black like it is shut off, the indicator on the monitor will go from green to yellow (like it is in sleep mode). The only way to restore things to reboot. I have tried everything from changing all setting reguarding video and ram in the bios (including resetting bios and using default setting), no change. I have uninstalled all video drivers completley using drivercleaner, and reinstalling 61.77, no change. I have checked to make sure that there is no power profile set or anything like that to turn off the monitor. I have done virus scans, adaware, hijack this, nothing. I am out of ideas. Is there any log files that might tell me what happens when this problem occurs? Is there any programs that will tell me if the GPU is over heating? (I have an excellent GPU cooler on it, GeForce 4 Ti4200). I just need some ideas of things to check, test, and try. I can't afford to just replace stuff till it is fixed. And I don't have any spares.