Apple iMac (17-inch Mid 2006) - Manual (Page 96)

iMac (17-inch Mid 2006/Late 2006 CD) Take Apart —Hard Drive Fan 
Hard Drive Fan
Tools
No tools are required to remove the optical drive fan.
Preliminary Steps
Before you begin, follow steps for removing the following:
Access door
Front bezel
Lower EMI shield
LCD display
Hard Drive
Optical drive
Speakers
Memory
Logic board
Part Location
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