Booting Into an Installation Medium
PC motherboards usually offer two ways to boot into an alternative medium. You can configure your default boot drives from the firmware interface, or you can choose a temporary boot device when you turn on your computer. The splash screen displayed when you power on your PC is part of a firmware interface installed on your motherboard, and it contains instructions for booting into your BIOS utility or choosing a temporary boot device. Usually, you select an option by pressing "F2," "F12" or a laptop hardware key. With the DVD or USB drive inserted in your computer, choose the appropriate option from the temporary boot menu or follow the BIOS utility instructions to permanently configure your boot-drive order.
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