G5 startsup one in five times and then goes to sleep

Hi - I have late 2004 dual G5. Recently it completely boots up and shortly after, puts itself to sleep even while I am working on it. Then it sometimes does not turn at all and just has a black screen.
I have done everything I can think of. Reset the PMU numerous times, done an openfirmware boot - but after reset it doesn't turn back on. Tried to boot from Install disk, doesn't work. Tried to reset PRAM - doesn't work. I have reseated the RAM and now it soemtimes turns on with half a balck screen and the rest white and then nothing happens.
I have unplugged it over night, held the power button down 15 seconds unplugged, etc...nothing works. It does not chime and if I remember correctly has been working without the chime for awhile.
If I leave it unplugged long enough, it eventually turns on and then I can look in the console log (exit on exit code:6) but I cannot run the disk utility or do much of anything else.
My G5 is like an old friend and I really don't want to lose her. Any advice would be greatly appreciated. Thanks

Thanks - I don't think it is the battery as I did replace it recently. I have tried to start up in openfirmware and never get past "cataloging file". I have tried Safe mode and can't get past the grey screen and I have tried C on startp - nothing. And finally, I have tried holding down option on startup and get to the right screen but it freezes when it gets to the watch. Guess I better give up and bring it to the shop and see if it is worth fixing.
It still turns on completely and goes through the whole start up process - it is just that it then goes into sleep mode. I can wake it 2 or 3 times and then I only get a black screen. I have to unplug the power from the back of the computer and let it sit at least 15 minutes for it to go through the startup process again.

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G5 startsup one in five times and then goes to sleep

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