One page I saw on googling suggested, obliquely, that this problem can arise due to bad RAM. So that might well be it, if it causes the same problems on different machines.
I was dicking around with a motherboard this weekend, had to get some DDR ram, all the advice from the forums was to get decent ram, as the motherboard was picky.
I got the cheapest possible and it worked anyway.
So maybe your bad ram will work on some other mobo one day.
"bad ram" probably has a different meaning in Wales.
The only compatability issue I know of is if you have PC100 RAM in your machine you can only add PC100, unless you get a 512 of PC133. Dunno if that helps at all.
Your whole "I dress like an office drone and act respectable and then sit on forum where we discuss urethra fucking and public torture" bit still creeps me out. I bet it would creep out your co-workers even more.