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Inspiron 5559 - Integrated display not working

Hello,

I have a problem on my new laptop Dell Insiron 5559.
It worked well for some weeks, but now, the integrated screen doesn't work.

The led twinkle white and orange; and the computer seems to work fine except the screen. An external monitor connected by HDMI is working perfectly, but it is "alone": windows doesn't even detect the integrated display.

I also tried some tests procedures:

From the dell support website, every display test is performed on the external monitor.

The tests triggered at start (when pressing Fn + Power) also use the HDMI screen, and detect an error:

Error Code: 0415
Validation Code: 121740
Service Tag: <ADMIN NOTE: Broken link has been removed from this post by Dell>

The strange thing is that when I start the other test procedure (by pressing D + Power at start), it is the integrated display that is used, and shows perfectly the different colors.

Can someone say what's wrong with this computer?

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