And because you saw this msg :
"No boot sector on hard disk - No bootable devices - press F1 to retry, F2 to go to options" - you were not actually booting from the cd. DBAN obviously wiped the disk but left the MBR intact, so the code from that has been loaded, but then it cannot locate the boot sector on the hdd... cos you wiped it. Anyway.. that is wot it is telling you. Reset your boot order using the F8 key at startup [F2?, or whatever key combo BIOS tells you to use] to set your cd as first boot device.