Boot from the USB, CD- or DVD-ROM: * Put boot medium with installer in slot and restart machine. * At boot, enter the BIOS by pressing <em>F2.</em> Some machines use other keys http://pcsupport.about.com/od/fixtheproblem/ht/accessbios.htm and if you have a Windows 8.1 tablet or device with a UEFI BIOS, then booting to the BIOS no longer works the way it did on classic desktop PCs http://www.makeuseof.com/tag/how-to-access-the-bios-on-a-windows-8-computer/ and once you are in, you have to shut off Secure Boot and Fast Boot in the UEFI or turn UEFI off completely in favour of "Legacy BIOS". * Set the BIOS to boot from your installation medium, save, and exit. Booting will continue and if all went well, your first installer screen appears.
Boot from the USB, CD- or DVD-ROM:
Booting will continue and if all went well, your first installer screen appears.