When
booting from USB media, you must change the BIOS boot order so the USB
device is listed first. Otherwise the computer will load from the hard
drive as normal.
Start by plugging the thumb drive into a USB port. Then to change the BIOS boot sequence:
• Press the Power button for your computer.
• During the initial startup screen, press ESC, F1, F2, F8 or F10.
(Depending on the company that created your version of BIOS, a menu may
appear.)
• When you choose to enter BIOS Setup, the setup utility page will appear.
• Using the arrow keys on your keyboard, select the BOOT tab. All of
the available system devices will be displayed in order of their boot
priority. You can reorder the devices here.
• Move USB to be first in the boot sequence.
• Save the change and then exit the BIOS Setup.
• The computer will restart using the new settings, booting from your USB drive.
• The installer boot menu will load.
UEFI/EFI
configuration, Windows 8 and Windows 10 computers usually have the new
UEFI/EFI that needs some configuration before you can proceed to boot
from a USB flash drive.
Access to this is as above for BIOS
You need to disable the secure boot option. Alternatives names can be any of the following, depending on your computer model:
• Legacy Support. If you have Legacy Support listed, make sure it’s On or Enabled.
• Legal CSM. If you have Legacy CSM listed, make sure it’s On or Enabled.
• Launch CSM. If you have Launch CSM listed, make sure it’s On or Enabled.
• CSM. If you have CSM, make sure it’s On or Enabled.
• UEFI/Legacy Boot. If you have a UEFI/Legacy Boot option, make sure it’s selected as Both or Legacy Only.