I have a late 2013 15" retina Macbook Pro. If I plug in the 24 inch cinema display and then power up the MBP, sometimes, it will freeze at the white screen with the apple logo. Closing and open the lid does not solve the problem. I have reset PRAM and SMC and that does not help either. If I power up the MBP and then plug in the display, I have no problem. The cinema display has the latest firmware and MBP is updated too. I only have this problem in recent two or three days. Since the 10.9.4 update comes out on June 30, do you think it is related to the update? Or do you think it is a hardware issue?