My 15" laptop screen is dark, but computer works fine with plug in large screen

I am not sure if I hit a key combo or something, but laptop screen is off.   Laptop is on and works fine and I can see everything on large plugged in 27" screen, nothing on laptop. It is as if I accidentally hit a toggle switch combo to turn off laptop screen while leaving on a plugged-in screen, like you can on a PC when going between laptop and, for example, a projector.  any ideas? I recently switched to mac after 20 years on a PC.  New MacBook pro. 

Hi, nope, tried that again just to be sure.  Thanks though.  The screen is completely black.  Worked fine yesterday and last night. 

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