Hmm, are you able to read the CD on another computer? And, have you tried putting any other CD in the drive, like music CDs or game CDs?
I had an opposite problem where WB 3.1 by itself wouldn't show a disc in the drive. Only after installing AsimCDFS did it show up. I remember this happening years ago on my GVP 030 combo board and it recently did it with my Tek060 board. And I had made sure all my settings in CD0: were correct.
