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I am new to Ubuntu. I was looking to see if double monitors were supported, and I accidentally disabled both of mine. What can I do? I tried plugging in a third monitor, but nothing happened.

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Have you tried restarting your computer? If nothing needs to be saved, press ctrl+alt+F1 and then ctrl+alt+delete How did you disable both monitors? Ubuntu will default back to the previous display settings if you do not click "accept." –  Vreality Feb 20 '13 at 3:51
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You might be able to use xrandr to turn your monitor back on. Switch to another terminal with ctl-alt-f1, login and typing xrandr will list your monitors. (assuming xrandr is installed- you might have to sudo apt-get install xrandr) From there it'll be something like xrandr --output FILL-IN-NAME-HERE --auto

Hope it works for you

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