Qosmio X770 display not recognized anymore

I just bought a Qosmio x770 about a month ago and some day when I started it the login screen never appeared.
In linux left me in command prompt and said that no screen configuration was found.
Windows said nothing but the screen remained black.
After a number of reboots it worked normally but only for a couple of hours.
Plugged to an external monitor it works.
Also when I boot in safemode (or failsafe) it works (I mean I can enter windows/linux at 640x480 resolution).
I updated the bios to the latest version 1.30. What more else to try?
It's really uncomfortable to send it back because I need it for my job (even connected to another monitor).
My hope is that the problem is not hardware related and somehow I can solve it.
Is there a chance?
Thank you!

I reinstalled the windows driver in safe mode ... and nothing.. But I didn't do anything before the problem appeared ... And linux is not recognizing the screen also. I tried to boot from an external hdd and the same problem. Fn F5 show me only the external monitor. I tried some 3d games on the external monitor and everything seem ok. When connected to hdmi linux boots up in X Windows but when running nvidia-settings there is no internal display ... only the external one.
The strange thing is that the internal display is working in safe mode ... is it possible to be damaged then?
Thank you

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