Acer Altos 12000 Series User Manual page 120

For the password to take effect you must set jumper JP4 to 1-2 (Check password):
1. Turn off and unplug the computer.
2. Open the computer housing and set JP4 to 1-2 (Check password) to check the
password function. See section 3.4 for the location of JP4.
3. Close your computer's housing and reboot your system.
The next time you want to enter the BIOS utility, you must key in your Setup
password.
Altos 12000 Series User's Guide