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When Ubuntu boots, the second monitor mirrors my other monitor, but when the login screen pops up, the monitor doesn't get any signal from my computer. When I go to monitor setup, it is not detected. If I unplug my first monitor, the second works fin with Ubuntu. When I tried 11.10 on a flash drive, it worked fine as a dual monitor. The default seems to be VGA over the DVI connection. Help?

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you need to provide more information - what video card and which monitor. – bodhi.zazen Dec 27 '11 at 20:55
Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information? – Jorge Castro Jan 3 '12 at 5:57

If you have an Nvidia card: install your drivers by opening Additional Drivers and installing the recommended option. Then, try checking out the settings in "nvidia-settings". Go into the Display Configuration category and make sure that neither of your monitors are disabled. If so, change them to TwinView.

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