This model does not have a PRAM battery. It uses a capacitor on the motherboard to store the date and time and will go down if not charged for a while. To get it back to working leave it plugged in for a couple of hour and:
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Try resetting the PRAM through Open Firmware:
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Boot Mac while simultaneously holding Command+Option+O+F
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When at the command prompt type the following:
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reset-nvram <Enter>
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reset-all <Enter>
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The Mac should now reboot into OSX with a reset PRAM.
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Also the RAM slot on this machine tends to fail. I would remove the RAM and try rebooting.
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The 12" machines do not have PRAM batteries. Here's Apple article on it: http://support.apple.com/kb/TA25911?view...