Introduction
Replacing the internal battery which regulates several functions in the computer, including the calendar.
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            Pull on outer latch. 
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            Lower door until it is level with your work surface. 
 
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            Locate the battery. 
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            Remove and replace battery. 
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            Push the PMU button once, and only once, to reset the power supply. 
 
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                                    Almost done!               
               
                                    Finish Line               
               