Sony computer User Manual

Page of 190
i.LINK 
Why isn't my i.LINK drive playing a CD or DVD properly? 
The i.LINK optical drive will not play a CD or DVD if the disc was inserted with the label facing down. Eject the CD or
DVD from the drive, and make sure the label is facing up. 
The disc may require a particular program that is not already installed on your computer. Install that program
according to the manufacturer's instructions. 
The DVD may not be compatible with the optical drive and a region code warning appears when you try to play it.
Make sure the region code listed on the DVD package is compatible with the drive. 
Page 183