Media player - no video - 2 monitor issue

[jcm1229]

I have an external monitor that I use to extend my desktop at work. Now that I'm in "Laptop only" mode, when I play a dvd through Windows Media Player, I hear the audio but see no video. Possible problem is that when at work the disply was on the external monitor. I can't go back to check this out.

Can I do anything to force to the laptop monitor? I'm at my wits end and can't get my video to dispaly. Any other ideas (even if the external monitor) isn't the issue.

Thanks!