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What is the output of your xorg.conf.nvidia ?
In the same time what bumblebee is saying with the command bumblebeed -vv ?

I suggest you a fresh new install but with the UEFI from your usb
Plug your usb, override boot, with F2 or F10 depending on your bios, at starting the laptop, boot options, select UEFI: "your usb...

If this little tuto has helped you tell me :)
If there is anything I've missed or you don't understand, feel free to ask me.

In your sources.list look messy and you miss the following:


deb http://http.kali.org/kali sana main non-free contrib

you should have:


# Regular repositories
deb...

Edited my first post, so dismissed this one.

Hi,

First, I suggest you to perform a new fresh install to start on solid bases.

- Edit your sources.list:



to have these repo: