Checkad all of that Woodchip, even tried new cable after first occurrance.
As I say it is intermittent, about once every 2 to 3 days, and seems to only happen after the PC has been "unused" for a long period. I say "unused" like that because the PC is on 24/7, and it is never actually unused, because UD steals all the spare CPU capacity.
I've re-fiddled with power-managemant settings and I'll see how it goes. The next thing is to disabled UD. etc. etc.
I was hoping someone could definitively say "graphics card fault" or "driver issue" or "mobo issue" or whatever.
Hopefully the system may 'settle-in' as its only been rebuilt since 22/12/03.
I'll post back if it never happens again (duh ??)
This thread is now locked and can not be replied to.