[xubuntu] Regaining my screen

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http://ubuntuforums.org – I am running Xubuntu 12.10 on a HP dv2000 laptop with no external monitor connected. I went into the display settings and unchecked use this monitor or something like that. As soon as I did that my screen went black. I'm assuming that it things that there is a second monitor and now the "second monitor" is the main display? How can I get my main screen back? Do I have to go into a config file to do this? I'm lost. Can't do anything without a screen. Thanks!!! (Hardware)