Have a new MacBook Air 13 (which I really like) and am exploring the use of the Mac through videos of Tech Talk America. But am having a problem. The video screen that comes up giving the lesson seems blurred. So I decided to expand it to full screen for a better picture, but the blurring is worse. The information is useable, largely because of the precise wording used in describing what is going on. Could not gain much info if I had to rely on reading it on the screen. Can some kind soul suggest what I can do to make this clearer? And please be detailed enough so that a novice can follow! Thanks!!