No backlight nor image on boot or OSX

First of all, sorry for my English 😉

Macbook Pro 13 2010 7.1 8GB Samsung 830 SSD. Clean fan, new thermal paste.

OSX 10.11.4

Win 10

After some experiments in Win 10 in order to underclock the NVidia 320M with nTune, my MacBook has not backlight or image on boot.

Explanation:

- I installed nTune on Win10. When started it blue screen of death appeared.

- In next reboot I observed that chimes sound, but the screen remains dark and without image until Win loads all drivers (if I unsinstall nVidia drivers, only works external monitor).

- Win loaded and all was/is normal. I can regulate the brightness even.

Then,

- I rebooted in OSX. Chimes sound, but no backlight nor image. OSX loads and image no appears. Only I obtain image when I connect a external monitor.

I reseted SMC, NVRAM, check disks, with no luck.

Any advice??? Thanks!!!