HP Compaq Presario,Presario 2105 Reference Manual page 75

6. Match your notebook to one of the following illustrations.
Use a pointed tool to remove the plugs from the 2 or 3 screw
holes, then remove the screws. The number of screws varies
by model.
7. Gently pull the hard drive out of the notebook.
8. Gently slide the new drive into the hard drive compartment.
Press firmly to make sure the connector seats properly.
9. Reinstall the hard drive screws and plugs.
✎
If you are installing a new hard drive, you should create a Utility
partition on the drive before loading any software.
Reference Guide
Add-On Devices
5–15