I just came home a little while ago from the Apple Store with a new 24" LED Cinema Display. I'm going to be using it with an iMac until I get a MacBook Pro. The problem is I cannot plug it into the mini display port on the back of my iMac, it doesn't seem to be matching up for some reason. I know I'm using the right adapter because the mini display port cable on the display, and the port on the back of the iMac have the same icon. Doesn't seem to make any sense.