Hi, I just bought my first mac a few weeks ago, a 1 ghz imac, and I love it, but just ran into my first compatability problem. I own a canon s30 digital cam, and I shot some short 20 second or so videos with it, transfered them to the mac, and renamed them. Other than that, I didn't edit them at all. The videos had always played on a windows PC before, but now when I burn them to a CD from the mac (by putting in a black CD, dragging them to the CD, and clicking burn) and attempt to view them on a windows computer, the file opens, sound plays, but no picture. Anyone know what's wrong? Thanks in advance.