Dimension 8400 BIOS (also known as System Setup) ClickHere
Entering System Setup 1. Turn on (or restart) your computer. 2. When the blue DELL™ logo appears, press immediately.
Look under Drives for: Diskette Drive Identifies and defines the floppy drive attached to the FLOPPY connector on the system board as Off, USB, Internal, or Read Only.
Also look under Boot Sequence
Diskette Drive — The computer attempts to boot from the floppy drive. If the floppy disk in the drive is not bootable, if no floppy disk is in the drive, or if there is no floppy drive installed in the computer, the computer generates an error message.