
I do not know any way of saving or converting a PPT file to play on a TV through DVD. As far as I know, a computer would have to be used. However I have a couple of alternative suggestions. Microsoft has a free programme called "Photostory" which allows you to make video from images - you can add titles, captions, music and the software is all wizard driven, really easy to use and great fun. You can only save as a WMV file (Windows media) though which means you would need to convert the file to a different format for TV use. There are lots of free little programmes that could help you with this.
For a more sophisticated output - you could use Windows Movie Maker which comes free with XP and VISTA. This does allow you to output to a DVD provided you have Windows DVD Maker, which is included in Windows Vista Ultimate and Windows Vista Home Premium and you also need a DVD burner.
I came across a fantastic web site - called animoto - that again creates video from images but to a very professional finish in my opinion. The output is in MP4 which has the added advantage of being able to play the short movies on mobile devices which I reckon students would love. I believe educational establishments can register for a free account.
http://animoto.com/All these programmes are really, really easy to use and I know it's probably not really the answer you are looking for but I think either of the 3 presents a good alternative to PowerPoint.