Dell XPS 730 (Late 2008) - Manual (Page 105)

System Setup 105
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.
4 At the Boot Device Menu, use the up- and down- arrow keys or press the
appropriate number on the keyboard to highlight the device that is to be
used for the current boot only, and then press <Enter>.
For example, if you are booting to a USB memory key, highlight
USB Flash
Device and press <Enter>.
NOTE: To boot to a USB device, the device must be bootable. To ensure that
your device is bootable, check the device documentation.
Changing Boot Sequence for Future Boots
1 Enter system setup (see "Entering System Setup" on page 97).
2 Use the arrow keys to highlight the Boot Sequence menu option and press
<Enter> to access the menu.
NOTE: Make a note of your current boot sequence in case you want to
restore it.
3 Press the up- and down-arrow keys to move through the list of devices.
4 Press the spacebar to enable or disable a device.
5 Press plus (+) or minus (–) to move a selected device up or down the list.
Clearing CMOS Settings
NOTE: This procedure does not clear or reset system and setup passwords.
1 Follow the procedures in "Before You Begin" on page 13.
2 Power down the computer and remove the power cord.
3 Power off all external peripherals.
4 Remove the computer cover (see "Replacing the Computer Cover" on
page 17).
5 Locate the Reset CMOS jumpers on the system board (see "System Board
Components" on page 8).
6 Remove jumper from pins 2 and 3.