My iBook G4 just won't charge the battery. System Profiler and coconutBattery both report that it should work, but it doesn't. The menu bar says that it's at 0%, and displays a plug. The power jack turns amber for a second, and then goes to green. I've tried resetting the NVRAM, the PRAM, and the PMU, but that hasn't fixed anything. What I want to know is, what went wrong, and is there any way to fix it without paying money?