I'm running a P4 3.2GHz desktop 1 GB DDR 512MB Nvidia 7600GS 200GB HD ECS PT800CE-A MoBo: I recently upgraded to 2 GB DDR, and began having problems when installing games where I would receive "Error 1335: data.cab file is corrupted, blah, blah, blah" which I linked to possibly being a memory problem. After downloading MemTest86+ and running it, about halfway through the test the screen went black, HD light turned a solid red, and the whole computer was unresponsive. The monitor light went from blue to orange and a "no signal detected" came on the screen (as if the hard disk was shut down). I reboot and try to run MemTest86+ again, and the same thing happens after about 2 minutes of running. Again I reboot, try again, and the same thing happens. Prior to running MemTest, I did have to go into the BIOS and change the boot order before running MemTest. Other than that I did not touch anything in the BIOS. After the issue, I reloaded optimized defaults in BIOS and updated the BIOS after the problem arose. I have also checked the BIOS for any USB legacy support and there is no option (as MemTest says if this is enabled, it may cause problems). I have since swapped back to my 1 GB known working memory and the problem persists. The problem also happens when I try to play games (running Dark Messiah of Might and Magic from CD and WoW from the HD). Game loads and runs fine for about 2 minutes before the screen goes black, unresponsive, etc. I have reinstalled (cleanly) my graphics drivers and the problem persists. Please help me. Other than when trying to run MemTest86+ and games, the computer runs normally. I traded an occasional install error for a complete lack of gaming. This blows.