(Guide) Installing Nvidia + Bumblebee + CUDA for Optimus enabled Laptops

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Please Help Someone, I am trying to install Nvidia from last few months but what ever I try It doesn't work.
Everything goes smoth till 14th step of current tutorial on first post.

But when I test it using:

~# optirun glxspheres64

I get this error:

[  126.985430] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) NVIDIA(GPU-0): Failed to initialize the NVIDIA GPU at PCI:1:0:0.  Please

[  126.985473] [ERROR]Aborting because fallback start is disabled.

Hi Rajnish,

Take a look at the solution tonrin posted.