Configuring BIOS to boot from disk drive before hard drive

When you start your computer, you should see during a short laps of time the Dell logo on your screen, and certainly at the top right angle of your screen, the key you need to press to enter BIOS config and/or Boot menu (usually F12 or F11, sometimes Escape).

"Bios setting are dependent on the motherboard installed, but they will fall down through the options like you want.

You can usually access the bios by hitting the bios key during boot, sometimes they will tell you which one, sometimes it just takes guessing around until it works.

Common keys are F10, F11, F12, ESC, or F2.

I think in your case it's probably F2."