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My computer doesn't show anything (No Signal) when the monitor's wire is connected to the graphics card. When connected to the motherboard directly it works - Ubuntu launches - but after logging in there isn't any left-hand menu bar and no menu bar on Terminal on launching it using Ctrl+Alt+T. And Alt+Tab doesn't work.

Did Unity crash? If so how can I get it back running? I had to type firefox & in terminal to get to this point.

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