Hello Khaotix, thanks for joining the graphics community.
The latest graphics drivers for the HD4000 are version 4061, would you please try to install this version and let me know the results? https://downloadcenter.intel.com/SearchResult.aspx?lang=eng&ProdId=3712
Also, are you using an external video card?
Have you tried doing a BIOS update on the motherboard?
Hello sylvia_intel, and thanks you for the reply.
Well, i've tried to install this version of the HD graphics and also updated my bios, but this still has no effect ...
Yes i use an external video card, but the problem solved by himself now. After many restartings of my computer and windows updates it seems that windows update succeeded in installing the driver, and now my second screen works perfectly !
Thanks you very much for your assistance !