Okay, I've searched for this on Google numerous times but I couldn't find any answers to this. When I play a movie with the DVD player on my late 2009 21,5 inch iMac the quality isn't that good. I've read that the iMac supports high definition. I was kind of dissapointed by that and I tried to find a solution to it. I've changed the HD setting on the DVD player but to no avail. Also, when I play downloaded movies on either VLC, Realplayer or Quicktime (by using Perian) it's the same bad quality. Now this could has to do with the quality of the download itsself but I remember a friend of mine downloading the same torrent once and it was great quality. It is a Sony Vaio wich supports high definition also. I'm totally lost now. I really want to see video's in HD quality on my iMac wich it is supposed to do. I hope someone can help me with this. Also, if someone posted about this same problem before, I'm sorry. I used the search function but there were over 40 pages of results and I couldn't find a title that resembled this.