I was trying to extent monitor, I get black screen on laptop and external monitor :/

so I have this hdmi cable that plugs into the DVI on my external monitor.
I did get the screen to show up just on the external monitor and that's it.  Now, when I boot up my lap top I get black screen on both monitors.  Uh oh.
I've unpugged the  monitor, batter, all that stuff.
I think it's possible I clicked on don't display external monitor or something, but not it's not displaying anywhere.
I have an idea pad of some sorts w/ windows 8.  I don't think it's 8.1
thanks
-Hayes

so I got this resolved.  the guy at the computer store hit f10 and then enter.  he did this while the screen was black
shouldnt' it just detect that there's not an external monitor?  but even when there was a monitor connected, both screens were black.
/thread

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