HP Pavilion Slimline s5220f Supplementary Manual page 53

3 Position the memory module over the socket, aligning
the notch with the tab in the socket.
4 Firmly press the module down into the socket until the
retaining clips at the ends of the socket lock the
module into place.
— Removing and Replacing Memory
537494-001
5 Connect the cables to the CD/DVD drive.
Your drive may have three or two cables.
6 Push the drive into the computer until it locks in place.
1
2
7