Acer Altos G710 - Manual (Page 128)

4 BIOS setup 118
4 Retype the password to verify the first entry then press Enter
again.
To remove the User password
1 Use the up/down keys to highlight the Clear User Password
parameter then press Enter.
2 Enter the current password then press Enter.
3 Press Enter twice without entering anything in the new and
confirm password fields.
After doing this, the system automatically sets the User password
parameter to Not Installed.