No Power on G4 and Apple Flat Display

This is what led up to the No Power event.
For the two days prior the computer was quiting out of applications ( Just iTunes sometimes and sometimes just Photoshop CS2) and going to the Log In screen even though I have it set to Never sleep or ShutDown in the preferences.
Also after I would do a SHUTDOWN the computer would boot itself back up.
The last event before the NO POWER issue was that I did not want the computer left ON and it kept rebooting itself after I SHUT it down, so after the last ShutDown before it had a chance to boot I unplugged it from the Power Source.
The computer booting itself up from a SHUTDOWN state is a problem I have had before.
Ever since I purchased the G4 and the Apple Display, the DISPLAY had a problem that kept turning the computer ON by istself after it was completley SHUTDOWN. Apple had me disable the Power Button on the screen through the preferences and that work around seemed to solve it. Now several years later, even though that setting is still disabled the computer was turning itself ON again.
Any help on getting the computer to power up again would be wonderful. Thank you.
G4   Mac OS X (10.3.8)   Apple Flat Panel Display

I have seen this problem with several different computers, from time to time (Windows boxes, particularly). I have an idea why it is happening: the power is not being completely cut to the machine.
Some other things to try:
1) The power button on the front of the case.
2) Disconnect all other devices but the keyboard and the mouse from the USB bus, and if you can, put them on different ports. Then try powering down from the keyboard.
3) Check to see that the power connection from the motherboard to the PSU is tight.
4) Make sure that there's nothing else in the case that's rattling around loose. If you have a screw loose inside a motherboard, all kinds of weird things can happen.
It's probably not OS X. It probably is the power supply, the USB port, or the motherboard. Not cheery news, I know. :o
HTH,
~FifthWheel

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