Hi
What screen resolution are you using..?
I found my scandoubler a bit fuzzy on the A4000 till I hooked it up with a Picasso.
Get IDEfix ( think its on Aminet ) and run this. It will pick up the CD no problem. I just installed a CDRom on my A4000d and IDEfix worked a treat. Also check the ribbon. My original ribbon wouldn`t work with the CD as someone had snipped the red edge... there is a reason for this but I can`t recall why.
scuzz