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DVD error suggestions
I found a similar problem report (Machine config not supported) at Mac OS X Hints, along with some suggestions that sound fairly useful. Here's the URL:
http://www.macosxhints.com/comment.php?mode=display&sid=20020219200617105&title=DVD+Playback+on+VGA+display+STILL+not+working&type=article&order=&pid=5532
My take:
Most likely, a lack of video memory or video chipset capability is preventing you from playing DVDs when you have an external monitor connected. Reducing resolution and/or bit depth might help here. As a quick test, you could try to play a DVD with the external monitor as the only active display (clamshell mode). If your wife's Powerbook is using DVD player 1.3, it is using hardware DVD decoding, which is an entirely different animal that the software decoder (V2.0 and up)
Another user in that thread suggested changing the permissions on the DVD player application, but I would say running the repair permissions feature of Disk Utility would be easier, and is good practice anyways.
Good Luck!
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