Hi all, I just bought the missus a 15" MBPr with the 370x GPU and I connected a Dell 2312 monitor to it via a minidisplayport to DVI adaptor. The problem is that when this adaptor is connected to the macbook, it only displays on the external monitor, the LCD stays dark. If I unplug the adaptor, the LCD will be on. Once I plug the adaptor back in, I'm back to 2 screens. Now I'm assuming that this is a 'feature' where the macbook thinks we are working with the external monitor only, ie clamshell mode even thought the LCD is open but other than forcing the macbook to detect displays, is there any other way to make the macbook boot with both screens active? Oddly enough, my old mid 2012 13" macbook pro doesn't have this issue.