How to Boot the PC from a different device (MSI B350, sept.2017 BIOS )

Power ON the PC, press the Delete key a few times to enter BIOS.
"Boot Priority" should be visible on the first page. Either drag and drop the icons using the mouse cursor, or use the keyboard to change the boot order (press the arrow keys until the Boot Priority section is highlighted, press Enter key on a device to select it, than use arrow keys to re-position it, press Enter again to deselect it).

When the computer is powered ON the first device from the left side will be booted, if that does not contain any operating systems than the second device will be booted, than the third and so on.

In this manner you can:
- Boot from Hard Drive
- Boot from a different Hard Drive
- Boot from CD/DVD
- Boot from USB (Flash Drive, external HDD or CD/DVD)

Related video:
How to boot from another Hard Drive (MSI B350 PC MATE, nov.2019 BIOS) ►    • How to boot from another Hard Drive (...