iMac G5, 17-inch Take Apart -
Fans, Upper
3. Lift the fan out of the computer.
4. If your are replacing the fan, remove the screws from the fan grommets. Using a
screwdriver, push the fan screws out of the grommets and set them aside. Use these
screws on the replacement fan.
5. Go on to the next step to remove the second fan.