I have been searching for this for 3 hours so figured I should post and try to save some time. Appreciate the help in advance. So I have a 27" Apple Cinema Display that has the Mini DisplayPort (not the thunderbolt model). Note: My Apple Cinema Display has 3 cords: Apple Laptop power cord, Mini DisplayPort cord, and USB cord. I plugged in the Mini DisplayPort to the Dell Laptop and also plugged in the USB to the Dell Laptop. I have the 3rd cord (power cord) plugged into my macbook pro (figured it needed that power to turn on the display?). . It basically just mirrors what is on my laptop and doesn't add another screen. For instance, when I plug my PC into my monitor at work it acts as another monitor where I can use the screen on my laptop and the monitor screen. Also, in regards to just mirroring the screen. Will the Apple Cinema Display not create a larger environment like it does when I connect my MBP?