Why is my MacBook Pro's screen going black for a second? I have a new MacBook Pro, when I'm using it the screen goes suddenly blank for a second and comes back, it feels like as if someone unplugged my screen and plugged it back immediately.. why does this happen? 

Initially I thought it was only happening when I'm running on battery, but happens even when I'm connected too.

This is very sporadic.
Clearly, something isn't right. I highly suggest you make an appointment at your nearest Apple Certified repair location or a Genius Bar.