It can be a bad memory chip. Things like that can happen. The best way of knowing if that's your problem is to replace your RAM. Well I know it's easier said then done but if you can find some RAM (from another computer maybe) just to try it out.
If you have one dimm of 512MB and were planning to buy another 512MB then you can try with only your new 512MB first and see if it fixes your problem.
Good luck,
Iceberg
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