Introduction
Tools
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Disconnect the hard drive thermal sensor by pulling the connector away from its socket parallel to the face of the hard drive.
 
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Press the hard drive bracket down toward the bottom edge of your iMac to free it from the rear case, then rotate the top of the drive toward yourself.
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Lift the hard drive off its lower pins and pull it out of the rear case, minding the cables that are still attached.
 
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Insert the flat end of a spudger into the gap between the SATA power connector and the hard drive.
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Twist the spudger to separate the SATA power connector from the hard drive.
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Pull the SATA power connector away from the hard drive.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.