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Have you tried giving the MacBook a PRAM reset? With the firmware password turned off hold down Cmnd+Opt+P+R, turn the computer on and wait for it to restart and you hear the start up chime before you let go.


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If you have your original discs load up the Applications Install disc and run the Apple Hardware Test from there. Look for memory faults. I doubt very much you have a firmware "bug", memory failure is much more likely and would explain the unusual hardware behaviour you're experiencing. I had the same model which I initially bought around 5 years ago, this ...



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