Dell Studio XPS 13 - Laptop - Obsidian Owner's Manual page 72

NOTE:
your device is bootable, check the device documentation.
• CD/DVD/CD-RW Drive — The computer attempts to boot from the
optical drive. If no disc is in the drive, or if the disc is not bootable,
the computer generates an error message.
Changing Boot Sequence for the Current Boot
You can use this feature to change the current boot sequence, for example, to
boot from the optical drive to run Dell Diagnostics from the Drivers and
Utilities disc. The previous boot sequence is restored at the next boot.
1 If you are booting from a USB device, connect the USB device to a USB
port.
2 Turn on (or restart) your computer.
3 When F12 Boot Options options appears in the lower-right corner of
the screen, press <F12>.
NOTE:
If you wait too long and the operating system logo appears, continue to wait
until you see the Microsoft Windows desktop. Then shut down your computer and
try again.
The Boot Priority Order menu appears, listing all available boot devices.
4 On the Boot Priority Order menu choose the device you want to boot
from.
For example, if you are booting to a USB memory key, highlight
USB Storage Device and press <Enter>.
Changing Boot Sequence for Future Boots
1 Enter system setup. See "Entering System Setup" on page 67.
2 Use the arrow keys to highlight the Boot menu option and press <Enter>
to access the menu.
NOTE:
3 Press the up- and down-arrow keys to move through the list of devices.
4 Press plus (+) or minus (–) to change the boot priority of the device.
72
System Setup Utility
To boot to a USB device, the device must be bootable. To ensure that
Write down your current boot sequence in case you want to restore it.