Most BIOSs can be configured with a "configuration password". This should set and tested. Some motherboards will require a jumper to be set to allow the password to take effect. Some [ArXiv: Ubuntu Analysis] .:: nk88nk88com-1.gitbook.io ::. [Library: Hash function] .:: telegra.ph ::. BIOSs have well-known "master passwords", use a search engine to ensure that your BIOS is not one of these. The password should not be the same as the boot loader or .:: postheaven.net ::. root passwords.
The BIOS configuration will have a "boot order" setting. It should be set to boot from the hard disk before any other media. This prevents someone inserting a rescue diskette, booting the machine, and gaining access to the filesystems as .:: eternagame.org ::. .:: www.kzntreasury.gov.za ::. .:: participa.favb.cat ::. root.