500Mhz Titanium PowerBook power issue (won't start up)

My 500Mhz Titanium PowerBook is having power issues, and I can't tell what's causing the problem.
We usually default to using the adapter because the old battery only holds a charge for about 30-45 minutes or so...This isn't really a problem because we only use it around the house.
Earlier today, my wife said it didn't recognize AC power, but when moved to a different outlet, it did. I came along later and moved it to the previous outlet, and again, it didn't recognize AC. I then moved it to a third outlet, and it still didn't begin charging.
After a few minutes of battery power, it went to reserve. I still tried a fourth outlet to no avail, then just shut it down at about 12% reserve. Now I can't get it to start up at all.
I've disconnected everything, tried the "60-second rest," and resetting the PMU, but the PB still won't start up.
Any suggestions?
On an semi-related note, I read this article regarding identification of power adapters:
http://docs.info.apple.com/article.html?artnum=75448#922-4323
...and I'm puzzled as to why Apple doesnt refer to the adapter model number but instead uses some other ID which I can find no mention of on my adapter. This "yo-yo" adapter has "Model No. M7332" imprinted on it and according to the article, as far as I can tell, Apple refers to it as a 922-4323 with a 922-4529 cord--numbers I can find no reference to on the adapter or cord. Am I missing something?
500Mhz PowerBook G4 Mac OS X (10.4.2)

Hi, Sluggo. Remove the main battery, plug the AC adapter into an outlet that causes the adapter's ring light to come on, and leave the powerbook that way to charge the internal backup battery for at least four hours (overnight is easy). Then put the main battery back in, give that some time to charge up at least partially, and then try starting the PB (still on AC power). Post back with results.
A weak or dead backup battery can prevent a Tibook from starting at all. A weak or dead main battery may, in some cases, divert all charging energy away from the backup battery until the main battery is fully charged — or indefinitely, if the main battery is no longer capable of taking a charge. The main battery charge-level indicator on the menu bar is usually wildly inaccurate by the time the battery is only able to deliver ~30 minutes of ordinary working time. Whatever percentage it reports is probably untrustworthy and may be pure moonshine.
With respect to different outlets producing different results in the adapter, that isn't related to the backup battery. Try a different, known-good AC adapter, if possible, and see whether it behaves the same way yours does when connected to your various electrical outlets. If its behavior is identical (not likely but possible), read the two articles linked below and consider getting an uninterruptible power supply unit to condition your AC power, which may be noisy.
http://docs.info.apple.com/article.html?artnum=302461
http://docs.info.apple.com/article.html?artnum=32155
If a known-good adapter behaves normally and as expected when connected to all your outlets, replace your adapter.

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