Sometimes it is necessary to change the boot order in BIOS to allow a computer to boot from a secondary source.

1. Enter into the BIOS and search for a menu entry labeled Boot or Startup.
2. When attempting to boot from a USB drive, connect the USB drive to the system before entering the BIOS, or it may not show up in the boot order.
3. Inside the Boot or Startup menu, there may be a Boot or Startup Sequence sub-menu.
4. Alternately, the boot order may simply be located at the bottom of the main Boot or Startup menu.
5. The order of priority for available boot devices can be changed by following the directions on the BIOS setup utility screen.

In this example, if USB HDD is above ATA HDD0, the computer will try to boot from USB HDD and then move on to ATA HDD0 if no operating system is present on the first device. In this version of BIOS, the plus and minus keys are used to move a device up and down the boot order. A device can be removed completely from the list or added back onto the list by pressing the Shift key combined with the 1 key. Once the preferred device is at the top of the boot order, press F10 to save the changes and exit the BIOS.

Keep in mind, other versions of BIOS may use different keys to perform these actions.

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