Hi guys, i bought a used powerbook G4, and i tried to put an external hardrive into the USB port, and it would not recognize that anything was in the USB port. Then, last night after the battery died, i tried to plug in the power cord and it would not work !! no green light/ orange light, nothing !! i then plugged the same powercord into my ibook, and it worked with taht computer. what is going on ?!