Einleitung
Internal Prerequisite.
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            Disconnect the SATA data and power cables by pulling their connectors away from the hard drive. 
 
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            Disconnect the hard drive thermal sensor cable from the thermal sensor attached to the side of the hard drive. 
 
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            Compress the plastic hard drive retainer by pushing it toward the bottom edge of the iMac. 
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            Pull the top edge of the hard drive slightly away from the rear case. 
 
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                            Abschluss
                          
                          To reassemble your device, follow these instructions in reverse order.