Two ways exist to reset the Bios/CMOS battery in laptops like the HP Pavilion N5415 that have the CMOS battery physically glued or soldered to the motherboard. The first is by removing power to the Bios causing it to restore to defaults without a set password or by using a program to identify the password.
- Disconnect the HP Pavilion from the power outlet.
- Remove the battery from the underside of the laptop. Allow the laptop to sit like this for 30 minutes to an hour.
- Replace the battery and connect to the power outlet again. Turn on the machine and allow the CMOS battery to reset to defaults in the computer.
Software CMOS Password Retrieval
- Download a program like PC CMOS Cleaner, HP Protect Tools or CmosPwd 4.8 (see Resources). Choose to “Save” the program when prompted to run or save. Locate the program in the folder you downloaded it to and click twice to install.
- Restart your computer and enter the “Bios” by following the on screen command given by your computer. This command will appear before the Windows logo appears and will specify which function key to press to enter Bios. Normally this is the “F2″ key. Check your computer manual if it does not appear on the screen. Locate the Bios manufacturer at the top of the screen. Write the manufacturer name down exactly as it appears. Press “Esc” to exit the Bios and allow Windows to boot normally.
- Go to “Start”–>”Programs” and locate the Bios password removal program you installed. Open the program and follow the on screen prompt that will allow the program to start retrieving possible passwords. This will be a “Start” or “Next” button.
- Locate your Bios manufacturer from the list that appears and write down the possible bypass password options given for your Bios Manufacturer. Some programs will bypass this step and just want to change, or delete the Bios password. Simply follow the onscreen instructions.
- Restart your computer and enter Bios again. Type in the possible passwords given by some password retrieval programs. Reset the password to something you will remember, when you have access. If these possible passwords do not work press”Esc” to exit the Bios and enter Windows again.
- Reopen the password removal program and locate a command that will allow the program to try to reset the password. The program command will say something like ” Reset Password,” “Change” or “Reset Bios.” Others may even say something like “Kill Bios Password.” Just follow the easy to understand on screen instruction prompts. Allow the program to reset the Bios to default, or change the password to one you have chosen.
- Restart the computer and enter the Bios. There should be no password in the Bios. Although you may have to reset other Bios commands as these were also reset to defaults.