Dell OptiPlex GX400 - Manual (Page 17)

Replacing a Hard Drive
1. Slide the drive into one of bracket bays, oriented so that the connectors on the back of the drive will face the interior of the chassis when the bracket is
reinstalled. See " Removing a Hard Drive from the Bracket ."
2. Align the screw hole(s) of the drive and bracket, and secure the drive in the bracket using the screws that came with the upgrade kit.
3. Reinstall the hard-drive bracket in the chassis.
Insert the drive bracket into the chassis, and rotate the bracket until the tabs snap into place.
Installing the Hard-Drive Bracket
4. Connect the interface cable for the drive. See " Attaching Hard-Drive Cables ."
a. If you are installing an EIDE device, ensure that the IDE interface cable is properly connected to the EIDE connector on the system board.
NOTE: Orient the drive in the bracket so that its bottom will face the left side of the chassis when the bracket is installed in the chassis.
NOTICE: To avoid possible damage, you must match the colored strip on the interface cable with pin 1 on both the drive and system board connectors.