Dell Vostro 420 (Late 2008) - Manual (Page 134)

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Safety Instructions
3 When F2 = Setup, F12 = Boot Menu appears in the upper-right
corner of the screen, press .
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 Device Menu appears, listing all available boot devices. Each
device has a number next to it.
4 At the bottom of the menu, enter the number of the device that is to be
used for the current boot only.
For example, if you are booting to a USB memory key, highlight USB Flash
Device and press .
NOTE:
To boot to a USB device, the device must be bootable. To make sure your
device is bootable, check the device documentation.
Changing Boot Sequence for Future Boots
1 Enter the system setup program (see "Entering the System Setup Program"
on page 129).
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.
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 (enabled devices have a
checkmark).
5 Press plus (+) or minus (–) to move a selected device up or down the list.
Clearing Forgotten Passwords
CAUTION:
Before working inside your computer, read the safety information that
shipped with your computer. For additional safety best practices information, see
the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance
1 Follow the procedures in "Before Working on Your Computer" on page 35.
2 Remove the computer cover (see "Removing the Computer Cover" on
page 47).
3 Locate the 3-pin password connector (PSWD) on the system board.