good evening , first post =) i'll try start out on right foot , sound half-way intelligent. acquired gimped powerbook g4 1 of our 'daughter' companies. laptop works fine when using a/c adapter. if unplug a/c adapter while power on, screen/keyboard lights go off. however, hard drive still spinning. if plug a/c adapter in, lcd backlight comes on, not display on screen. have hold power button down few seconds power down completely. upon turning on, works fine again. sound battery issue or motherboard problem? have checked battery serial number against recall list , 1 supposably good. in advance! to me sounds hardware (or possibly software) problem. run permissions repair (using disc utility) , make sure software date (use software update check). fresh install of osx may solve too, had similar problem ibook , sorted it, may motherboard issue; if have hardware test disc, run...
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