does boot and cant turn off but front light on
The mac stopped working but front light is still on and i cant turn it off
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First reset the PMU (Power Management Unit). Here's how: http://support.apple.com/kb/ht1939
Next replace the 3.6 volt 1/2 AA PRAM battery. Next see if you can reset the PRAM and Nvram: http://support.apple.com/kb/ht1379
Next observe the diagnostic lights on the logic board before and after trying to start and let us know what they are.
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