Introduction
Remove your front bezel to gain access to your iMac's internals.
Tools
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Loosen the single Phillips screw in the center of the access door.
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Remove the access door from your iMac.
 
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Remove the following 12 screws securing the front bezel to the rear case:
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Eight 13 mm T8 Torx screws
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Four 25 mm T8 Torx screws
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Six 13 mm T8 Torx screws
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Four 25 mm T8 Torx screws
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Two 35 mm T8 Torx screws
 
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Gently lift the front bezel from its top edge off the rear case. It helps to use your thumbs to push down very gently on the corners of the display.
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Once the top edge of the front bezel has cleared the rear case, rotate the front bezel toward the stand and lift it off the rear case.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
PH2 head necessary to remove screw.
airshack -
Mine was as written, a PH1.
tpivo -