I downloaded three small movies from an RCA "Small Wonder" mini video camera (neat gadget) to my MacBook (10.4.11) via its self-contained USB connector. They appeared initially as .avi files. I then opened and viewed them with QuickTime (no problem); saved them as self-contained .mov files; and sent them to my granddaughter, who has an iBook G4 She now reports she can't open them, or if she can, the video plays black. What might she need, or what conversion might I make before re-sending them? (Sorry, don't know any details of her system.) Thanks for any hints.