HP Compaq Presario,Presario 7954 Supplementary Manual page 45

1. Read all the manufacturer's documentation for the new drive.
2. Close all programs.
3. Remove all diskettes and CDs.
4. From the Windows Taskbar, click the Start button, click Shut Down, select
Shut Down, and then click OK.
5. Unplug the computer power cord from the electrical outlet.
6. Disconnect all cables and power cords from the back of the computer.
7. Remove the computer cover.
8. Disconnect the power supply cable from the drive you are replacing.
9. Disconnect the data cable. Be sure to mark the data cable connector on the
system board so that you can properly connect the data cable for the new
device.