I have recently discovered that my 14" ibook (combo), which I bought last year, has serious difficulties reading dvd-r discs (video mpeg2). DVD Player stops randomly at some point in the movie saying it can't read the disc because it's dirty or corrupted (I/O error n. 36). On the other hand my Windows machine reads them easily as well as my PIONEER 444 stand-alone DVD Player. I would like to know if this is a common issue with COMBO IBOOKS or if there may be a hardware or software problem. Commercial DVD do not pose any problem.