"Not Charging" Message

Hi:
I have several chargers, but for the last couple of months regardless of the one which charger I decided to use, when I plug one into my PowerBook G4 I see a "Not Charging" message at the top of the desktop for at least 5 minutes.
This is the location where I'm used to seeing the little charging symbol and the number of minutes until full charge, or the word "Charged", or, if running on battery, the number of minutes I have until the battery is discharged.
I've never seen this before. Is it common? Any thoughts about how to remove it? As mentioned, usually after five or so minutes the display switches to show that the battery is indeed charging. But once or twice with a very low battery it took a long time before the battery started charging and once the PowerBook wouldn't even start up despite being connected to the charger.
Any thoughts?

You know, I'm not even kidding, but I just noticed that myself by total coincidence. (People might think I make this stuff up, but I don't. Some of these problems people have, I find myself having prior to reading up on it. Though, not very often).
Here's my observation.
At work, where I primarily use this 15-inch machine, it is connected to my 65W AC adapter. I've never gotten a "Not Charging" message next to the battery icon (with plug icon inside... which would indicate connected to power source but battery not charging, thus the message, or the other which would say "Charged") when I plug in with the 65W.
However... where I just noticed the same "Not Charging" message on plug in, but it doesn't take five minutes to clear up is when I'm using a third party AC adapter that's rated 45W. It's a MacAlly charger for iBooks and PowerBooks.
My hypothesis is because of that recommedation--one which I've given myself many times (so then why am I going against it?)--that 45W chargers, even though they work, are not designed for the aluminum 15-inch PowerBook and the 17-inch models. The Titanium PowerBook G4 came with 45W chargers, as did the dual-USB iBook G3s and later iBooks. 12-inch PowerBooks came with 45W adapters as well.
Aluminum 15-inch and 17-inch PowerBook G4s use the 65W adapter and aptly so because the machine needs more juice in order to power the internals. Using a 45W adapter "works" but is not recommended because it can cause damage to the system and it doesn't get enough juice that it needs to draw from the adapter.
(To answer a comment, I rarely bring the PowerBook home, but if and when I do, my backup charger happens to be that 45W MacAlly adapter).
It's okay to use a 65W adapter on 12-inch PowerBooks, Titanium PowerBook G4s, and G3 & G4 iBooks that originally shipped with a 45W one.
So, after all that, my guess is that you may be using a 45W adapter with your 15-inch model and that may be the cause of the "Not Charging" message. Although, after all that as well, if you're using a 65W adapter, then it may be a glitch.
Then again, you may want to do this to solve the problem:
Battery Update
[http://www.apple.com/support/downloads/batteryupdate.html]
PowerBook G4 DLSD Firmware Update
[http://docs.info.apple.com/article.html?artnum=303035]

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Thanks for sharing it! great!

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