HP Compaq Presario,Presario 7954 Supplementary Manual page 43

If your Internet PC has the primary hard drive installed in the lower slot of the
drive cage, under the diskette drive, and the top drive compartment is open,
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. To add a 5.25" hard drive, place the new hard drive in the top drive
compartment and secure the drive with the side retaining screws as shown.