No Video (audio only) Playing MP4 or M4V in QT Pro 7

I have QuickTime Pro 7.6.6
MacBook Pro - 2.33 GHz Intel Core Duo
OSX version 10.5.8
2 GB Ram
When I try to play MP4 or M4V files, I don't get any video, just audio when trying to play them with QuickTime Pro. The weird thing is, the same files will play OK from the finder window using preview (space bar). These same files will generally play OK in Final Cut Pro 6 too. I only have problems trying to play them with QuickTime Pro. I think I used to be able to play these files in the past, (but I'm so old now, it's hard for me to be sure).
I also have a MacPro Desktop machine OSX 10.6.4 - 2 X 2.26 GHz Quad-Core Intel Xeon and QuickTime 7.6.3 and the same files play fine using QT Pro.
Sorry if this has been asked and answered before. I spent a couple of hours searching and reviewing posts and couldn't find anything that addressed my problem.

How would I go about posting a short sample though? I've never done that before.
Generally speaking, most mail clients will allow an attachment of 20 MBs or less if you want to email it. Larger sample files are normally posted to an online server. If you have a MobileMe account, the easiest thing to do would be to post it to your public area (or gallery or an iWeb page). If you don't have an Apple account, you can try posting it to your ISP server space. (I.e., most ISPs provide varying amounts of user space but you would have to check your ISP FAQs to learn how much space is provided and how to access your space. Lastly, some online sites provide space on a third-party basis if you sign up with them. These services may be free or incur a monthly charge. As a last resort, you can contact me at my profile email address for an additional alternative.
Do MP4 files play in QuickTime 7 for you?
Yes, compatible MPEG-4 and H.264 (MPEG-4/AVC) files play under QT 7 (OS 10.4.11, 10.5.8, and 10.6.5) and QT X (OS 10.6.5) on various platforms I'm still using in MP4, M4V, and MOV file containers. However, remember that there are many "flavors" of MPEG-4 content and some may require third-party codec component to be compatible with QT. In addition, some codec combinations cause conflicts when installed together on the same system. (E.g., the Perian component package may not play well with DivX components installed.)

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