Apple iMac (17-inch Mid 2006) - Manual (Page 99)

iMac (17-inch Mid 2006/Late 2006) Take Apart — AC Power Inlet 
Removing the AC Line Filter
Using a torx T10 screwdriver, remove the three self-tapping screws from the power inlet.
Using a torx T10 screwdriver, remove the machine screw from the power inlet ground cable.
Peel the EMI tape off the power inlet.
Disconnect the power inlet-to-power supply cables and unlace the power inlet cable from
beneath the chassis.
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922-7069 (x1)