There is black bar in the middle of my screen.

There is black bar in the middle of my screen. I have a Macbookair, 2011. I was writing in word when it happend.
I have restarted the machine, its still there, done a hardware test, nothing is wrong. What should I do

If the black bar appears immediately upon booting (at the grey screen) then I'd suspect you have a hardware failure of part of the screen. 
An external monitor could help confirm that it's not a software issue where OSX *thinks* there should be a black bar there :-) .  If you hook up an external monitor and have OSX set to mirror the displays (which I believe is the default setting for a new monitor) see if the black bar is also on the external monitor.  If it's not, I think you need a new screen for the Air.

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