Precision 3541 black screen

Hi all,

i'm facing a very bad problem that is leading to data and hours of work loss.

My Precision 3541 goes suddenly black screen, no audio no video signal, applications are forcibly closed. Fan stills on, keyboards backlit reacts to mouse's movements and keyboard's key press.

Using official Dell's SupportAssist app, i updated Bios and Drivers. 

Using Nvidia control panel, each software used are set to be executed with Intel graphics.

Booting in "Support" mode, the laptop shutted down itself while executing the extensive memory check.

Any Help would be really welcome.

Mattia