My computer runs Windows 98SE. Had a problem recently with a virus/trojan which generated spelling errors in the DOS start-up screen & then some weird stuff to the display after windows kicked in. Norton identified a couple of suspect files which I deleted. This solved most of the problems except that I have been left with a display which is clearly faulty - the colours are washed out & there is ghosting, rather like a poor TV reception. I've checked screen settings (they're OK) & tried updating drivers for video card (Nvidia Geforce DDR) but no improvement. Would welcome suggestions on what to do next/
You should also check that the monitor lead to your computer is fully inserted, preferably with the retaining screws in place and screwed down. A bad connection could cause the symptoms you are seeing.
Have unstalled & reinstalled display drivers - to no avail. In the process, I installed standard VGA Driver & noted that ghosting was still as bad. Also as bad when in safe mode. By a process of elimination, am now convinced it is not a driver problem. Could it be the motherboard, and if so how can I tell?