Hi, I have a macbook pro 2010, core i5. I tried it with two external monitors and in both cases it does not detect the monitor unless I restart the laptop with the external monitor cable attached. - I tested it with the mini displayport to VGA for the projector - I tested it with mini displayport to displayport and the Dell U3011 LCD. After the restart, it works fine and both monitors are detected but if I disconnect the LCD from laptop and plug it again, it wont work until I restart it. I had mac os 10.6.x and now I upgraded to 10.7 and still the same issue. Any comment or help is welcome. Thanks.