Dell XPS 730 (Late 2008) - Manual (Page 83)

Replacing Fans 81
6 To install the hard drive fan, slide the fan between the hard drive bays until
it snaps into place.
7 Connect the fan cable to the FAN_HDD connector on the Master Control
Board (see "Master Control Board" on page 12).
8 Replace the computer cover (see "Replacing the Computer Cover" on
page 17).
9 Connect your computer and devices to electrical outlets, and then turn
them on.
1 hard-drive fan release latch 2 hard drive fan
2
1