Normally, the computer starts to a boot manager loaded from
the secondary storage device of the computer. Occasionally, you may
need to start the computer to 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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When the power button light is on, press F12 repeatedly.
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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 UEFI 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.