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Hi, My laptop monitor recently went black and it only starts to work when I connect another monitor to the laptop, when I do this, the other monitor doesn't work and my laptop's monitor starts to work again, can you help me with that?

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Sir press fn + f1 to f12 there is a botton responsible about chang monitor
best regardes
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Posted on Mar 28, 2011

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This is a very common problem,

Most monitors go due to the connection, for example when you open and close the lid this loosens the connection so this is your problem.

You may be able to find and download the service manual on google, and take it step by step from there or take it in for a service.

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I have had this before with my Dell Latitude C540/640. I don't know the ACER 5720 but here's a couple possible fixes for you.

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2. Try closing and opening the lid of your laptop. Sounds a bit strange but it works sometimes for me. My guess is when you close you screen it would "dim/turn off" the LCD and re-opening it convinces it to turn the screen back on.

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