Powerbook G4 Wont Boot consistently

I have an older Powerbook G4 867. ('Twas my first mac-**sniff**) abt 4 years ago, I was on my couch surfing and the screen went black. I never got it to reboot. A while later I got it to boot out of the blue. It worked fine, ran some software updates but when went back to the same problem when it rebboted for updates.
Today, I decided to pull it out ofthe closet and give it a try. It booted right up! First thing I tried was going onto Disk Utilities and ran all the checks and it showed no problems with the HD.
Ran 4-5 OS X and Java updates, a hand full of office 2004 updates fine. Rebooted every time. I was going to dig up the original OS X discs and boot into the disc and check any thing there. I set it down with the screen open, letting the battery charge while I cooked dinner. I glanced over at it periodically and it was charging and the screen was dimming slowly. After dinner it would not wake, and went into the same symptoms:
When hitting power, you hear a slight click.
Nothing starts, no screen, no welcome chime, etc.
The machine acts like it is powered on, since the CAPS Lock light toggles on and off.
Have to hold Power for 10 seconds then caps lock-and machine "shuts gown" Theres a slight noise when this happens
I researched here and tried the following:
Tried the PMU reset.
I can't do the PRAM since it never goes into start up.
Tried the NVRAM, again, nothing happens-etc.
I am thinking its toast. Thoughts?

OK, some things come to mind here.  First suspect is the internal PRAM./clock/backup battery.  We'll get to that in a moment.
The first thing you should try is a PMU reset.  That button is under the keyboard.  That may be all that is needed.
Now, we need to deal with batteries.  First off, how many green LEDs light on the main battery when you press the test button?  When on the charger, do you have the amber/green indication at the plug, as appropriate?  If you can get the battery to full charge, we might be able to kick-start the internal backup battery by shutting down the computer, connecting to the AC adapter and then removing the main battery and leaving things for at least 8-10 hours in that condition.  That will attempt to force charge the backup battery.  A weak or failed internal backup on that particular machine can cause some maddening behaviors.
The backup battery may be tested by putting a running system to sleep, disconnecting the AC adapter and then removing the main battery for five seconds.  If the machine stays in sleep and then can be waked, the backup battery is serviceable.  If the machine shuts down, then the backup battery is discharged or plain kaput.  I have seen reports of the backup batteries keeling over in five years or so, although I have one TiBook that is over nine years old and the backup battery is still working fine, meaning I'm batting 0.500 on backup batteries.
Oh, and a good source for main batteries is OWC.  Recommended by others as well, and the one I got from them a year or two ago is chugging along just fine.

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