The first thing I would do is replace the 1/2 AA 3.6 volt lithium PRAM battery. It is located on the logic board. See step #10 of this guide: [guide|1563]
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There is no guide for your model but these machines are almost identical except for the processors.
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There is no guide for your M5521 model but these machines are almost identical except for the processors.
The first thing I would do is replace the 1/2 AA 3.6 volt lithium PRAM battery. It is located on the logic board. See step #10 of this guide: [guide|1563]
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There is no guide for your model but these machines are almost identical except for the processors.
The first thing I would do is replace the 1/2 AA 3.6 volt lithium PRAM battery. It is located on the logic board. See step #10 of this guide: [guide|1563]