I have been offline since Friday, and my computer is in the workshop and won't be looked at by the technician until this Friday. Before taking it to the workshop, I tried it with a borrowed monitor, and it still wouldn't boot up. So I think that the problem is not with the monitor. I then went back and tried with the original monitor, and this time it managed the POST= Power On Self Test. So that seems to also indicate it is not the monitor. However, it will not show the login screen for me to enter my login. The screen remains completely black with no cusror. I have noticed with the side of the tower removed, that the CPU fan starts and stops the during the bootup attempt. I am running XP Pro SP2. P.S. I am posting this from my local library. So, it looks like I will be off the air for the foreseeable future...say at least until next Monday at the ealiest.