I've spent a lot of time over the years helping people out in forums, now I could really use some solid advice myself! I am experiencing intermittant harware lockups that I cannot logically tie to any specific activity; it seems to occur totally at random. The symptom is always the same: display freezes and audio playing (if any) gets stuck in a 20-millisecond-or-so loop. Machine is unresponsive to stimulous except hard reboot. This sometimes occurs during strenuous system activity, sometimes during NO system activity (i.e. overnight). Sometimes the system automatically reboots before it has even loaded Windows. I know for a fact it is not a software problem, because the same thing happens in linux (although not as often). I've even reformat/reinstalled to be sure. It was totally stable about a month ago, and it started locking up once or twice a week. Recently, it locks up 2-4 times daily, at random intervals. Here's my system specs, maybe you can make some sense of this: OS1: Windows 2000 Pro SP4 OS2: Redhat Linux 9.0 PSU: 500-watt (550max) UL-rated MB: ABIT KG7 RAID CPU: AMD Athlon XP 2000+ (Non-Overclocked) RAM: 512mb PC2100 Kingston ValueRAM (Default Clocks) Video: ATI Radeon 128mb 8500LE HDD: Western Digital Caviar 80gb w/8mb cache Sound: SB Live! NIC: D-Link DFE 530TX+ I thought at first it might be a bad video card, as lockups almost always occur after a while of 3D Gaming. However, I recently ran ATI's tech demos overnight with no lockups. Just to be certain though, I tried a different video card.... still no love. Now I'm leaning towards a possible failing power supply. If anyone has a clue, please share!