Introduction
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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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.