Bluescreen

Ok I connected a video projector to a macbook pro via HDMI . At first it worked somewhat fine but the resolution was messed up so I tried to change it and the screen on the laptop went blue and the projector was displaying "NO SIGNAL". Now the projector wont display anything no matter on what resolution I set the laptop. How do I fix this ?
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More about bluescreen
  1. The laptop res doesn't matter unless you have mirrored displays in which case only resolutions that will work on both displays will show up. If you don't have a mirrored display setup, there will be two lists of resolutions that come up - one for the macbook monitor and one for the projector.
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Blue Screen Resolution Projector Mac OS X