Dell Precision T3400 (Late 2007) - Manual (Page 238)

238
Adding and Replacing Parts
2 If you are installing a new drive, remove the drive-panel insert (see
"Removing a Drive-Panel Insert" on page 218) and remove the shoulder
screws from the inside of the drive-panel insert and attach the screws to
the new drive.
3 Gently slide the drive into place until the drive securely clicks into
position.
4 Connect the power cable to the drive, and connect the CD/DVD-drive
cable to the drive and to the system board.