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My Macbook Pro restarts happily but when i do a shut down it wont start unless i first hold down command option p r. PRAM
this is a clean install.
the start up gets as far as the apple.
thanks for any suggestions
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You might have answered your own question!
Your PRAM battery (CMOS to us windows folk) may be dead / dying. Each battery is supposed to output a certain amount of power to keep your computer's settings intact even when it is off.
I would assume your PRAM battery is dead, and zapping it allows you to boot.
Good luck!
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Please give us the last three figures of your serial number.
из mayer