iMac G5, 17-inch Take Apart -
Fans, Upper
3. Tuck the video cable into the space between the fan and the hard drive.
4. Lower the larger fan into the chassis, lining up the screws with the screw holes.
Caution: Move the fan cable (from the smaller fan) out from under the larger fan as
you lower the fan into the chassis. Tighten the two fan screws.