I'm pretty new to Mac and getting to really like it. I got a late 2005 15" PowerBook and it does just what I need it to with one exception. I do a lot of presentations with video inserts. I'm having problems with video that I've downloaded with the PowerBook. If I download with the ThinkPad and transfer on a thumb drive, it works fine. Could it be a problem with the airport card? I'm not sure which card it has.