I teach basic video production in a high school and yesterday discovered that none of my students could download any footage into imovie hd from any of the cameras we have in class. We have 6 mini's and two imacs, we're using Canon GL2's and JVC widescreen miniDV cameras. Overnight, nothing is now working? When we plug the camera's in, the software no longer recognizes the camera and we no longer get the blue screen ready to import. Software updates were run on all of the minis and imacs but to no avail...Any ideas? Even when I plug numerous camera's into my MacBookPRO nothing registers. This is very frustrating....and I have a class in two hours!