Powerbook and boot from CD problem

[Jason Warm]

I am trying to install YDL from downloaded iso files.  I have tried 
burning the CD on both Mac and PC and the result is the same.  When I 
boot into OS 9, the CD mounts fine and I am able to read it, but when I 
hold down "C" to try to boot off the CD-ROM it fails everytime and 
simply boots from the HD.  It does seem like it starts to read the CD, 
but simply continues on to boot off the hard drive.

Jason