After the monitor was installed he was First able to boot windows but it would go to black screen very quickly. After that the computer would no longer turn on/off using the power switch on the front panel. He was however able to restart using the hard restart button on the front panel. He was able to reset the computer, then turn off the power supply, let it sit for a few minutes, and then power up, but it immediately went to black screen and locked up again.
He reinstalled the old monitor it started up and seemed to work. So he took the 245BW back to the store. They tested it on a computer at the store and it immediately crashed that computer. At this point it seemed the problem was solved. They gave him a new monitor and sent him home.
Installed the new monitor and the exact same problem as above occurred. He went back to the old monitor and used the reset, kill power supply trick to get the computer back up and running again. This time once windows loaded the disk check program started up (not sure why I am getting all info over the phone on this). Disk check ran for close to an hour the computer locked up and monitor went to black screen. Again the front panel power button was not functioning and he again used the hard restart, immediately killed the power supply on back of computer, let it sit, powered it back up to get it running. It started the disk check at the same spot where it previously crashed and it immediately locked up again. Only now this time there is no power to the machine at all. No matter what he does he can not get it to power up, not even to the BIOS.
Any thoughts on this would be greatly appreciated. Thanks again and Thanks for reading this long post.