I have a stable system which has been working fine since June 2008.
Mainboard: Gigabyte P35-DS3
GPU: Nvidia Geforce 9800 GTX
CPU: Intel Core 2 Duo E8400 @ 3000MHz
Memory: 4096 MB
Hard Disk: Western Digital WD5000AAKS-00A7B2 ATA Device (500GB)
I mostly use it for playing games, did not experience any problems till now. Today while I was playing "World of Tanks", there has been a power fluctuation which lasted for a very tiny amount of time. Other electrical devices that has been working didn't turn off or reset, however my computer froze up. After rebooting the system, I tried to play the same game which resulted in a frozen screen, keyboard or mouse did not respond. So I tried a second reboot. Computer was up with 800x600 resolution. Device Manager had an exclamation mark on video card. At that point, I did a System Restore to 1 day ago. After reboot, screen resolution was back up to 1680x1050, it was all looking good. I decided to check video card by using a software and I found this: