restart wont restart after shutdown

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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