Make sure you have the right model number for your CD-i
An early model:
The one shaped more like a traditional game console:
The ones intended as part of high-end home theater systems:
The most advanced consumer-level model:
If you're not sure which one you have, the most obvious marker will be the drive door. The 910/205 has a curved door, the 210 has a plain door, and the 220 conceals the drive behind a flat panel.