Apple Power Macintosh G4/400 Reboot problem

I recently got a Apple Power Macintosh G4/400 running OS X 10.3.9 - just updated via Software update.
My problem is that the machine will not do a reboot after booting up and running for a while (doing some activity, such as software update, etc).
Upon reboot, the screen will flicker, it appears to go through some amount of POST, but ultimately nothing. I cannot power it down with the power button -- instead I pull the plug.
I can then boot the machine up after a short while (ie, leaving the machine off) -- no problem. But if I try to reboot again -- no luck.
Any assistance or pointers would be greatly appreciated.

The funny thing is, the G4 boots up without issue -- when it has been left powered-down for a few minutes.
I tried an experiment -- I pulled the battery and booted the machine. No problem booting! I then inserted my Tiger disc and attempted the reboot to install the new OS.
Still would not reboot -- I get the "bong" but the screen just continuously flashes and nothing happens.
I got to thinking maybe it is the battery and it boots fine after leaving it for a while because maybe it gains some power back or something.
So I powered down again -- still the battery is out and has been out for a good while. I then insert the power plug, hit the button and it boots up no problem. I then open the case, and attempt the Tiger upgrade again -- click reboot button.
This time when it powers off I quickly push the battery back in hoping it would reboot with a "fresh" battery. But -- no reboot. Same issue/symptoms.
Thanks for answering.

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