Laptop External Screen DVD slower

[CyberNatas]

why would connecting a 12" LCD to a Dell 7500 laptop show slow performance when playing DVDs? The laptops 15" screen plays DVDs GREAT, I close the laptop and connect a 12" LCD and its choppy...any ideas?

Thanks

 

[Guest_imported]

Don't know what OS you are using, but try this.

In the video options, go to the tab that allows you to select your video output devices (VGA/LCD/External/RCA)

Make the VGA out (External monitor) the PRIMARY device.

See if that helps.