Athlon 1ghz-2 toasted--help please

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Ok I can understand only the new heatsink part. Very possibly you had a bad (or wrong) heatsink that was not properly seating on the cpu core. Downgrading to pc-100 does not make any sense at all. You are losing considerable performance in terms of your memory bandwith by doing this and I would advise you know that you have the system up and running to go back to pc-133.

A little bit of knowledge is a dangerous thing!
 
ncogneto, thanks for the reply, the original heatsink was a taisol which is on the AMD approved list, I cant understand it either as nothing we did should theoretically have any effect, are there a load of duff chips out there?.
anyway the good thing is I ended up with 128mb pc133 CL2 as once it was up and running he didnt want to change any hardware