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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.


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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