HP Pavilion Slimline s5220f Supplementary Manual page 28

11 Replace the system fan screw.
NOTE: This is one of the short screws on select
models.
12 Insert the CD/DVD drive partway into the computer.
12
13 Connect the cables to the drive.
14 Push the drive into the computer until it locks in place.
— Removing and Replacing the Hard Disk Drive
537496-001
Your drive may have three or two cables.
1
2