Why does the Retina Screen on MBPR2013 make a Weird Flash when I have a External Display via HDMI hooked up?

I just bought a new 2013 early MACBOOK PRO RETINA.  When i have an external Display hooked up via the HDMI port, I noitce when I wake the computer UP it has a Different type OF QUICK FLASH that comes up than when there is nothing hooked up so I don't know if that makes sense to anyone, but its very disturbing to me, it makes me wonder if there is something wrong with the HDMI PORT ?????   Has anyone else experienced this or knows if this is NORMAL behavior of the new RETINA displays or the HDMI port makes it FLASH weird upon WAKE UP???   I have unplugged the HDMI and when I do the SCREEN comes up normally it just blinks on.  But when HDMI is used its light lightening stike.  Don't know  how else to explain it, maybe i need to do a video and Post a video.

One more disturbing thing.  When the screen on my MBP goes black and I check the system preferences for "Displays", the MacBook Pro display is not presented as an existing display.  Only the still-functioning Apple 20" Cinema Display. 
Where did it go??

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