IBook G4 charge toggles on and off

All of the sudden, when we plug in our MacAlly PS-AC4 charger into our iBookG4, the computer recognizes that a plug has been inserted, goes into charging mode (the icon at the top changes), the screen goes brighter -- and then less than a second later, it changes back into battery mode (dimmer screen, different icon) -- and then it changes back again, over and over. Not only is this distracting, the computer is not charging.
I read through a bunch of messages on this board and tried a number of suggestions. Here's some facts:
- The iBook is less than 2 years old and very gently used
- The input isn't wiggly or moving at all
- We got the MacAlly 2 mos ago after the factory charger stopped working at all. Until recently, we've had 0 problems.
- I reset the PMU
- When the charger is inserted while the computer is on, system information does not recognize it as inserted.
- When turned off, the computer does appear to take a charge.
- The battery stats seem to me (a non-techie) to be fine.
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 4366
Remaining Capacity (mAh): 2041
Amperage (mA): -1082
Voltage (mV): 11211
Cycle Count: 47
I'm beginning to think that the fault lies with the MacAlly charger. However, are there any other possible causes I'm not seeing? Anything else we can do or try? Thanks in advance for your help!

It seems to me the only things that could cause your symptoms are a bad charger which is shutting off when the extra charging current is drawn, or a bad battery which is open circuit and won't accept a charge (goes instantly to full-charge Voltage). It sounds like the computer will run off the battery, so the latter isn't likely. Other possible culprits would be a confused PMU which didn't really get reset (there's more than one way to reset a PMU, so be sure you're doing the right one for your model iBook), a loose power input connection, or a broken wire at the power plug.
There's also a chip in the battery, and they sometimes get confused. Cycling the battery (full discharge followed by a full charge) sometimes helps. There is a battery reset utility, but I don't know if it works on G4s.
http://www.apple.com/downloads/macosx/apple/firmware_hardware/batteryupdate.html

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It seems to me the only things that could cause your symptoms are a bad charger which is shutting off when the extra charging current is drawn, or a bad battery which is open circuit and won't accept a charge (goes instantly to full-charge Voltage). It sounds like the computer will run off the battery, so the latter isn't likely. Other possible culprits would be a confused PMU which didn't really get reset (there's more than one way to reset a PMU, so be sure you're doing the right one for your model iBook), a loose power input connection, or a broken wire at the power plug.
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