Dell Precision T3400 (Late 2007) - Manual (Page 94)

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System Setup
NOTE:
To boot to a USB device, the device must be bootable. To make sure 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 81).
2 Use the arrow keys to highlight the Boot Sequence menu option and press
to access the menu.
NOTE:
Write down your current boot sequence in case you want to restore it
later.
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.