Hello Folks,
Many thanks for the replies.
PC is 12 months old, runs WinXP Home and does have an on/off rocker switch on the back as well as the on/off button on the front.
It also seems to have started behaving itself again and over the two days since I posted the message at the top of the thread has not lost any time at all despite being off from the mains for a fair chunk of that time.
So, I think I'll leave the CMOS battery alone for the time being I think and just see if it happens again in the future.
Thanks again.
WF.
p.s. Richard, was out at NAC earlier this year and will be with you again mid Jan with some friends
