BIOS

The BIOS (Basic Input/Output System) is until recently the firmware of each IBM-compatible PC and Laptop.

Configuration
For configuration enter the BIOS setup. To enter the setup you have to press a computer specific key, like: You can find the right key in your motherboard or computer manual, but it may also be shown during boot time, right after after poweron. To enter setup press the key about two seconds after poweron, even if there is no screen displayed.

In the setup you can configure several features:
 * Enable or disable built-in hardware devices.
 * Configure hardware features.
 * Set date and time.
 * Select a boot drive and order.
 * Specify a boot password.

To operate the setup with an USB keyboard, you have to enable a function called USB Legacy or similar.

Set boot drive and order
You change in the BIOS setup the boot drive and order. Set the first drive where you installed the bootloader to speed up boot time. The BIOS take some time to check optical and floppy disk drives for a valid boot loader.

For USB boot drives you have to enable the function called USB Legacy or similar.

Newer BIOS versions let you press a key during boot to open a menu, where you can select the boot drive. This is handy, if you want to boot from a LiveCD. Possible keys are: You can find the right key in your motherboard or computer manual, but it may also be shown during boot time, right after after poweron. To show to boot menu press the key about two seconds after poweron, even if there is no screen displayed.

External resources

 * UEFI.