My Laptop screen has gone Dark

I have a Lenovo Ideapad Z500, Intel I7, 3612QM, 6GB Ram with an Nvidia GT740M Graphic Card.
My display was absolutely fine, till I installed Windows 8.1. After a few minutes of working properly, the laptop screen went dark.
I have installed all available updates for Windows, and have also updated the drivers for the graphics card, however the screen is still dark.
Kindly suggest a way to fix this

You should read this
http://download.lenovo.com/lenovo/content/windows8-1/upgrade/ideapad/index_en.html
It is not recommended to upgrade the following models to Windows® 8.1 because some VGA related issues cannot be solved by the vendor, currently.
U310, U410, U510, U410 Touch, U310 Touch;
Z500 Touch,
Z500, Z400, Z400 Touch, Z380, Z480, Z580, Z485, Z585;
S300, S400, S400u, S400 Touch, S405, S206, G485, G585, N480.

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