How to replace keep alive clock battery

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:

Try resetting the PRAM through Open Firmware:

Boot Mac while simultaneously holding Command+Option+O+F

When at the command prompt type the following:

reset-nvram <Enter>

reset-all <Enter>

The Mac should now reboot into OSX with a reset PRAM.

Also the RAM slot on this machine tends to fail. I would remove the RAM and try rebooting.

The 12" machines do not have PRAM batteries. Here's Apple article on it: http://support.apple.com/kb/TA25911?view...