iBook power problems


I'm pretty new to Macs and have a Blueberry that has power issues. The power plug seemed to glow properly for a day or so while I was configuring some software. All the sudden, the plug does not glow and the computer is running off a barely charged battery (probably why hangs while booting, but that's another question). Does anyone know if there is a circuit breaker or something I should be looking for inside the iBook?
The wall adaptor may be shot. I had one of the puck style adaptor, and a wire came loose on the nipple part. Nothing could be done except get a new one. If you know anyone with another adaptor, give it a try.
Try a different wall jack, as well. Sometimes the adapters just don't seem to like certain plugs, for some reason or other.