Released in 2003, the iBook G4 replaced the iBook G3 as Apple's portable consumer computer.

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system locks up after power up.

unit only works on main power. After a short period horizontal lines appear across the bottom end of the screen and the system locks up.

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Try the quick fixes I recommended on this will not start up from HD or CD.

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Could the system have fried. The fan is not running.


Also the system does not work on battery power


As I told the Poster on the question i forwarded to you. If none of the software and hardware fixes rememdy the situation, the it's most likely a bad logic board. This particular machine had many logic board failures


+ very nice link


Good answer +


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Aston Ffrench will be eternally grateful.
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