ClubMan, how would I recognise the video card?
SirOurs, I don't have another monitor immediately to hand to test the problem. The screen resolution is 1280 X 1024. When I boot up, the screen resolution is fine - yesterday, the problem occurred after the PC had been up and running for several hours without any problem.
I am just trying to figure out if the problem is likely to occur with increasing frequency and if so, if there is anything I can do to prevent that.
Given that the problem occurs infrequently (I haven't had the problem today, the problem occurred yesterday and about 2 months previously), I doubt if the problem could be caused by a video card not properly connected or an inappropriate screen resolution - I would have thought that these factors, if present, would make the problem a constant one.
Perhaps my knowledge or logic is lacking. Please let me know if you think so.