Normally, the computer starts with a boot manager loaded
from the secondary storage device of the computer. Occasionally, you
may need to start the computer with a program or boot manager loaded
from another device or a network location. After the system firmware
initializes all devices, you can press an interruption key to display
the boot menu and select a desired boot device.
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Turn on or restart the computer.
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Press F12.
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From the boot device menu, select a boot device to start
the computer.
You can make a permanent change on boot devices in the UEFI/BIOS
setup utility. Select the Boot menu; in the EFI section, select the desired boot device and move
it to the top of the device list. Save changes and exit the setup
utility for the change to take effect.