Dell Dimension 8400 - Manual (Page 101)

Removing and Installing Parts
101
Installing a CD/DVD Drive
1 If you are installing a new drive, unpack the drive and prepare it for installation.
Check the documentation that accompanied the drive to verify that the drive is configured
for your computer. If you are installing an IDE drive, configure the drive for the cable select
setting.
2 Connect the new drive to the set of rails that are attached to the inside of the cover. If a set of
rails is not attached inside the cover, contact Dell (see page 123).
3 If you are installing a replacement drive and the new drive does not have the bracket rails
attached, remove the rails from the old drive by removing the two screws that secure each rail
to the drive. Attach the bracket to the new drive by aligning the screw holes on the drive with
the screw holes on the bracket rails and then inserting and tightening all four screws (two
screws on each rail).