Hi everyone, I just picked up a 24" LED Cinema Display for my 2015 MBP, I'm having several issues. First up, the display only powers on if the Mini-display is connected first. If the USB/Power are plugged in first, the display fails to turn on. The display doesn't allow me to change the brightness. The USB's on the back work perfectly fine however. And finally, due to the above mentioning of the Mini-display having to be plugged in first, I cannot run the display in Clamshell mode. Am I doing something wrong? Is the fact its mini-display instead of Thunderbolt a leading cause? Any help will be much appreciated. This display is gorgeous, it would be incredible if it worked perfectly! EDIT: If I run a video on YouTube and close the display, the audio will continue playing on the display but the picture will disappear. Pausing and playing as well, the audio will continue on the display, but the picture turns to black.