HP 6 - Manual (Page 46)

2 How to Install Accessories In Your PC
Installing Mass Storage Devices
34 English
9 At the rear of the computer, replace the metal plate. Insert the flat
end first then push it until it clicks into place.
10 Connect the power cable and the data cable to the rear of the drive.
The connectors are shaped to go in one way only. If you are not
sure which connector to use, refer to "Connecting IDE Devices", on
page 27.
11 Install any other accessories before replacing the power supply and
cover. Reconnect all cables and power cords.
12 Verify the new configuration by checking the HP Summary Screen
(refer to page 44).