Gateway 200STM User Manual page 270

Chapter 17: Troubleshooting
A DVD movie will not play
Make sure the label or side you want to play is facing up.
Shut down and restart your computer.
The DVD's regional code and your computer's regional code may not
match. Regional codes help control DVD title exports and help reduce
illegal disc distribution. To be able to play a DVD, the regional code on
the disc and the regional code for the DVD drive must match.
The regional code on your DVD drive is determined by delivery address
for your computer. The regional code for the disc is on the disc, disc
documentation, or packaging.
To clean a CD or DVD:
264
Wipe from the center to the edge, not around in a circle, using a
product made especially for the purpose.
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