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I've a problem with HDMI on my ultrabook. One week ago it worked fine but now there is a problem. When I connect it, Ubuntu recognize the monitor-tv but it's black/blank, no image will display. Someone can help me? Thanks

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Ok, let's try and see if Ubuntu knows the second monitor. Open the Dash and type "Display". Enter the program and you should see 2 monitors there, one your laptop and the other your monitor connected trough HDMI.
Click on the external monitor and make sure it is set to "ON".

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Hi, thanks for your answer. Yes the second monitor/tv is set to ON –  freddyparisi May 26 '13 at 11:39
    
You say it worked for you, did you made some modifications to the drivers or something? –  Rat2000 May 26 '13 at 12:25
    
no @Rat2000, with VGA it works fine. –  freddyparisi May 26 '13 at 12:53
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