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I have a miniDP to VGA adapter, and its worked fine until this morning, I woke up and shook the mouse, but only the internal MacBook screen worked, not the external monitor. I tried to reset SMC and PRAM but it did not help. What might be wrong?

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Did you disconnect the miniDP and reconnect it? Sometimes OSX loses track of it. –  Martín Marconcini Mar 27 '11 at 14:34
    
Have you tried the usual things to rule out the chance that it's a problem with your monitor? You can always make sure that everything's plugged in and turned on. If the monitor has a test function, you can try it to make sure that the monitor still works. –  Nathan Greenstein Mar 27 '11 at 16:54
    
I tried diferent type and size monitors –  user4710 Mar 27 '11 at 21:00
    
@MartínMarconcini when I can't get peripherals to be recognized suddenly, I always: a) disconnect EVERYTHING I can (for laptops that is everything) b) reboot zapping the PRAM (hold down 'command-option-p-r' keys during boot up until you hear at least a second chime, which should be at/near maximum normal volume, screen brightness will also revert to default (on laptops). c) restart again, then connect periphs back up. –  NOTjust -- user4304 Mar 21 '13 at 15:52

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