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Black screen on laptop

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Hey everyone. I'm hoping you can help me with this problem.

I have an Asus K55V laptop with Win7 installed. I normally use an external monitor plugged in while i play games. Apparently there's 2 graphic cards in the laptop, an Intel HD4000 and a Nvidia GT630M. I don't know if this is possible, but I tried disabling the Inten HD4000 in device manager so the laptop would use the Nvidia card only. This gave me a problem, and now my laptop screen is totally dead, even after restarting the system several times. This happens with and without the external monitor.

Anyone who can help me?

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