CD won't spin on boot

I just received my Knoppix 3.3 CD from TuxCDs.

I entered BIOS and changed the order of booting to CDROM, C, A and placed the Knoppix CD in the drive. When powering up the computer, the CD does not spin up and booting resorts to the HD O/S, W2K. Ideas on how to solve this problem?

TIA, George

Solved my own problem by creating a boot diskette.

I still wonder what it is that makes the CD spinup on booting this O/S?

George