In article ,
Rob wrote:
Just disable suspect software, and/or try to replicate the fault in safe
mode (F7 on boot IIRC).

Happens in safe mode too. Should have mentioned that.

PCs are basically a few components - you have to
work through and isolate. My guess from what you say would be MB on a
new PC - the trickiest component to test alas.

I've fairly extensive experience of electronic faults but this one doesn't
follow the norm.

--
*Procrastinate now

Dave Plowman London SW
To e-mail, change noise into sound.