No, RAM in 1 bit - upgraded about 6 months ago so not much muck at all. Found an old copy of Active Disk Monitor so updated it and ran - temp fine (37C) and nothing found there.
Had my old battery still, so I've put it back in to see if it might be that.
I haven't tried leaving it up in Safe mode to see if it goes BSOD! I'll do that and report back.
Many thanks for the help. I just need it to last for another 18 months until I retire - I only really use it for dragging to the sim and hotels!! Nice new iMac at home!
Cheers
mcdhu
BTW, had a look in the event log - not that it means anything to me, but there was much mention of 'SideBy Side' code 32 and 39???!!!