HP Compaq Presario,Presario 7954 Supplementary Manual page 41

To ensure proper installation, please read all the manufacturer's documentation for
the new hard drive.
If your Internet PC has the primary hard drive installed in the top drive
compartment of the chassis cage, complete the following steps:
1. Close all programs.
2. Remove all diskettes and CDs.
3. From the Windows Taskbar, click the Start button, click Shut Down, select
Shut Down, and then click OK.
4. Unplug the computer power cord from the electrical outlet.
5. Disconnect all cables and power cords from the back of the computer.
6. Remove the computer cover.
7. Refer to the drive manufacturer's instructions when inserting the secondary
hard drive into the bottom slot of the drive cage.