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My ASUS A53SV laptop has an onboard Intel GMA graphics and also nVidia GeForce 540N. I am using Windows 7 Pro. I thought that the GeForce was not being used, so I went to Device Manager and disabled Intel graphics.

After that, my screen turned black and I could't see anything. I turned the laptop off and turned it on again – 'Resuming Windows' logo appears and then I only see a blinking cursor on a black screen.

I can't get into safe mode by hitting F8 and I can't enter BIOS either as usually (by holding Alt+F2 when ASUS logo splashes).

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hmm, but why doesn't F8 work? – XXL Nov 5 '11 at 11:40
@XLL Hell, how do I know? I am more concerned about BIOS... – noname Nov 5 '11 at 11:49
I don't think Windows will have altered your ability to get into the bios. The Asus site says Del is the key to get into the bios. – Paul Nov 5 '11 at 12:14
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In last resort you may want to restore the BIOS to its default settings: http://www.ehow.com/how_5024662_reset-asus-motherboard.html

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I solved it by switching off my laptop definetely by holding power button. After that, I was able to get into safe mode and restoring both video controllers in Device Manager.

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