Hi, I'm having problems with my PowerBook battery. It seems like the battery isn't connected to the PB, but it is. The little battery icon in the top has an "X". Sometimes it comes back to the plugued icon, but if I try to unplug it, the computer turns off, but it turns on normally without being pluged. It's really weird . The icon keeps switching from X to plugued. Specfifications -1.33 GHz PowerPC G4 -768 MB DDR SDRAM -Combo Drive -15" monitor -Mac OS X v.10.3.5 Thanks!