Bad RAM is the #1 cause of random reboots.
The quick docmemory is less then worthless. I tested it with a known bad stick of RAM, it found nothing wrong. Set it up some night before you go to sleep.
Also, I discovered this a few weeks ago. Any RAM in my second DIMM slot (rows 2 & 3) would cause random reboots, it was really odd, and I still do not understand it, but I now have 256megs of PC2100 with no where to go on my motherboard.
The second thing to check is your BIOS settings. Its probably not the problem, but its simple to check. In particuar make sure your bus speeds, and memory settings are correct.
The third thing to check is your PSU. Athlons HATE bad power. A good number of motherboards offer the option of reporting the CPU voltage, this can be useful for diagnosing a bad PSU. If your motherboard offers this option, take advantage of this.
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