I do not think anyone can help but I have what seems the common problem of a P4C800-E DELUX not booting.
After about 18 months my machine decided that it was not going to boot up. The fans started, the keyboard flashed but the monitor stayed in standby.
Changed the video card for an old one. That did not fix it. So unplugged it and left it for 3 or so days. Took it to my local computer shop to see if they could identify the faulty component, but when they connected it up, hey presto it booted up.
I get it back and decide to reinstal WIN 2000 Professional. Problem now it wont recognise the SATA drives in a RAID 0 config. The bit where you press F6 and then install 3rd party drivers. So I change the BIOS to IDE for the SATA drives. Press F6 on WIN 2000, install load drivers fine and all words. Unfortunately while installing one of the drivers, Bluetooth I think, the PC decides to hang. No choice have to switch off. Now it fails to boot again. OK so I reset the bios with the jumper.
Get it working again but same happens again, lock up, have to switch off but now I cannot get it to reboot by any means.
Its Sunday and a public holiday here in the UK tomorrow so I cannot replace the board untill Tuesday. Anyone got any ideas on the problem before I replace the board.