Hi guys Sometimes I connect my rMBP to my Panasonic to watch movies. I use a hdmi-hdmi cable and the display automatically detects the resolution and everything is fine. However when I disconnect my Mac and use it without the screen it keeps the black bars at the bottom and top during startup. I have to reset pram for this to keep happening. Is that normal and is there anything I can do to prevent it? The same thing goes when using Airplay-mirroring.