Dell Studio 1558 (Early 2010) - Manual (Page 310)

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System Setup
Performing a One-Time Boot
You can set a one-time-only boot sequence without entering the system setup
program.
1 Shut down the computer through the Start menu.
2 Turn on the computer. When the DELL logo appears, press <F12>
immediately.
If you wait too long and the Windows logo appears, continue to wait until
you see the Windows desktop, then shut down your computer and try
again.
3 When the boot device list appears, highlight the device from which you
want to boot and press <Enter>.
The computer boots to the selected device.
The next time you reboot the computer, the previous boot order is restored.
Changing Boot Sequence to a USB Device
1 Connect the USB device to a USB connector.
2 Turn on (or restart) your computer.
3 When
F2 = Setup, F12 = Boot Menu appears in the upper-right
corner of the screen, press <F12>.
If you wait too long and the operating system logo appears, continue to
wait until you see the Windows desktop, then shut down your computer
and try again.
4 The Boot Menu appears, listing all available boot devices.
5 Use the arrow keys to select the appropriate device (for the current boot
only).
NOTE:
To boot to a USB device, the device must be bootable. To ensure that a
device is bootable, check the device documentation.
Changing the BIOS Settings
The BIOS is a utility that serves as an interface between the computer
hardware and the operating system. The BIOS settings may need to be
updated for certain hardware replacements.