Here is my problem. I built this system 3 months ago. I have just moved from the USA to Australia. After arriving here and unpacking it, the computer booted up fine and ran for several hours. Then the screen went black and monitor turned off. When ever I booted it got to the windows XP is loading bar, then goes black and monitor is in what seems to be standby mode. I removed the card (AGP 256 meg Geforce 6600-Aopen brand) and put in an old Geforce MX420 which works fine. Later tried newest drivers with 6600 and then reverted to old ones. The last thing that happend is, it seemed to be fine (except it flickered to a black screen more than normal while installing older drivers.) After I got it all up and working, tried a game and it loaded, then rebooted. It likes to flash to a black screen back and forth on the desktop as well. Not sure what to do at this point. AMD 64 3400+, 2 GIGs of Dual Channel RAM, Aopen 6600 256 MEG, 2 Maxtor 200 GIG drives (1 SATA, 1 IDE) SONY Dual Layer DVD Burner. Good actual power supply, not one of those ones that come in cheapo cases. Yes I switched to proper voltage when i moved to AUS.