How do I start the computer with the DBAN media? It just boots from the hard disk.

Change the "boot order" of the computer.

Run the BIOS setup program and put the floppy drive and ROM drive first in the boot order. Do this by pushing <ESC> <DEL> <F1> or <F2> when you power-on the computer. The correct button varies between computers. Watch for a prompt when you power-on the computer or consult the motherboard documentation.

Some computers will ask for a password before running the BIOS setup program. You can usually defeat this check by opening the case and removing the "CMOS cell" from the motherboard, which looks like a large round watch battery.