Dell Dimension E521 - Manual (Page 57)

1. If you are booting to a USB device, connect the USB device to a USB connector (see Front View of the Computer ).
2. Turn on (or restart) your computer.
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.
4. Press to continue.
The Boot Menu appears, listing all available boot devices.
5. Use the arrow keys to select the appropriate device (for the current boot only).
Changing Boot Sequence for Future Boots
1. Enter system setup, select Boot Sequence from the System group (see Entering System Setup ).
2. Press to access the menu.
3. Press the up- and down-arrow keys to highlight the appropriate Boot Sequence option.
4. Press the U or D keys to move the option up or down in the boot sequence.
5. Press to Save the changes or to Cancel.
Clearing Forgotten Passwords
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the computer cover (see Removing the Computer Cover ).
NOTE: Keyboard failure may result when a key on the keyboard is held down for extended periods of time. To avoid possible keyboard failure,
press and release in even intervals until the Boot Device Menu appears.
NOTE: To boot to a USB device, the device must be bootable. To make sure your device is bootable, check the device documentation.
NOTE: Write down your current boot sequence in case you want to restore it.
NOTE: To boot to a USB device, the device must be bootable. To make sure your device is bootable, check the device documentation.
CAUTION: Before you perform any of the procedures in this section, follow the safety instructions in the Product Information Guide.