I have a desktop which won't start (XP Home). When I switch it on, the processor fan races making a very loud noise. But if I reset the CMOS jumper on the motherboard and then switch it on, the computer works fine.
After I've switched it off, I have to go through the same process of resetting the jumper.
I've changed the battery on the m/b but can't think of any other reason for this problem.
Any suggestions please?