Computer won't charge (battery or cord)

My computer is just over a year old and the battery has been wearing down over the past couple months, but can still last nearly an hour.
In the past couple days my computer has randomly turned off several times and will take anywhere from a couple minutes to a day to turn back on (resetting doesn't help)
Now i've got my computer on and plugged in (the light on the cable is yellow)
but it says the battery is at 0% (which doesn't change) and the computer goes to sleep within a minute. I've tried plugging it in with different cables, and tried removing the battery, but it still won't stay "awake" for more than a minute.
help, thanks
any advice would be greatly appreciated.
iBook G4   Mac OS X (10.4.2)   the battery pack is slightly loose, not a perfect fit.

My computer is just over a year old and the battery
has been wearing down over the past couple months,
but can still last nearly an hour.
In the past couple days my computer has randomly
turned off several times and will take anywhere from
a couple minutes to a day to turn back on (resetting
doesn't help)
Now i've got my computer on and plugged in (the light
on the cable is yellow)
but it says the battery is at 0% (which doesn't
change) and the computer goes to sleep within a
minute. I've tried plugging it in with different
cables, and tried removing the battery, but it still
won't stay "awake" for more than a minute.
help, thanks
any advice would be greatly appreciated.
iBook G4   Mac OS X (10.4.2)
  the battery pack is slightly loose, not a
perfect fit.
It appears your battery is dead. I have a G4 12 inch model with same issue. you will need to purchase another battery.
Ted

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