My Dad has a 2006 17" iMac that is fully updated and it does have a camera built in as it should. My Dad also has a cannon all in one printer scanner copy machine hooked up to the computer. As of this moment, when I hit an application like Photo Booth or something else that uses the camera, the program says that no camera is connected. I did a little detective work and found where someone hooked up an all in one HP device and the scanner took over the "port" that the iSight camera was supposed to be on. I don't know if this is the problem or not but it was all I could come up with. I am pretty Novice when it comes to computers and don't know how to tell what is on any port or how many ports their even are for that matter. I really want to fix this problem but I don't know how. Does anyone have any ideas??