Display not working after using external monitor

I was using my Macbook Air last night to watch via my external monitor displayed to a tv.  After I was done, I put my macbook Air in "Sleep" mode via the external display.  This morning when I startup my Macbook, I have a blank screen.  My suspicians are it's still in the "External display" mode.  Anyone experienced this before and found a way to switch back to normal display via key sequence or something?

Reset the NVRAM:
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the third time.
Release the keys.

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