My Computer is on BUT I can not see the screen to dark?

My computer is on and I can the my front screen.  BUT it is too dark , so I can't see what to do.  I was having trouble and I had to reset the  PRAM.  Is this why I can not see the screen.  And how do I fix it?
Jeanne

I believe the keys on an imac are F11 and F12, for dark / bright respectively.
Try that, I think it'll work.
If not, then try out all the "F" keys, one of them will work.
Ben

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