PowerMac G4 (Mirror door drive) shuts down automatically when starting up.

I use a PowerMac G4 (Mirror door drive) 1.25 Ghz processor with1.25 GB ram, 80GB HDD. OS 10.2.7
Recently I could not start the machine as it automaticallyshuts down during starting when the log in dialog box appears. It also creates excessivesounds (hopefully from the processor fan) during starting up.
What is the possible cause for it? Upgrading the OS (10.5.8) could solve it? Or suggestions from exparts like you? Plz Help.

Thanks BDAqua. Sorry, no actionsworked. I think, the possible cause might be, the processor heats up more andthe fan start rotate more to cool down the processors and it makes the sound.But processor becomes hotter and the CPU automatically shuts down.
Apple service center in my townseparated, cleaned and reinstalled the processor & motherboard from thecase but NO IMPROVEMENT. They are trying to suggest (with confusion) changingthe processor. Do the diagnosis going right path? They do not have any G4 1.25 GHzprocessor, where will I get it?  Anysuggestions from the experts of this forum?

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