x31 ram memory problem? Motherboard?

[thatcher]

Simple question:
What would happen if, while my x31 was running happily under xp pro , the the ram became unseated?

Every now and again I get a blue screen of 'death' and my computer shuts off. Sometimes it turns right back on again, and sometimes not. However I can always solve the problem by pulling both the memory and reinserting them.

After rebooting and an error report to good old microsoft I am told that there was a stop error error likely caused by a faulty driver. I don't think this is the case because I've done a full reinstall to factory defaults and still the same thing happens on and off.

Any ideas? Or even better, any solutions?

[Thinkalot]

I also experience strangest crashes on my X31 all out of a sudden with a certain 1GB ram module. If i replace it with a 512 MB, everything works fine.

Don't know whether it is a mobo issue or ram module related.