T420 how to turn on graphics card

Hello

I was experimenting with configuratition in windows 7 and I turnd off the coast of the graphics card. Now when I turn the t420 screen is black boot. I tried to get into the bios with the f1, but the screen is all black too. How can I activate graphics card so I can see something on the laptop screen.

Hello

I've solved my problem, I Frédérique have removed the battery from the laptop and placed it back and it helped.

Thank you

Tags: ThinkPad Notebooks

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