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problem with video output on external monitor Dell inspiron 3542

Hello i am an owner of a Dell inspiron 3542 i7 with 840m. 

I have a question that the tech support in Greece couldn't solve. When i plug the hdmi on my laptop and i connect it to a screen if the screen is bigger then 19' then everything is messed up. The colors the resolution everything. 

I noticed that the hdmi is connected to the integrated graphics card which powers the display of the laptop of course and has and output of 1300sth resolution. So when i connect it my laptop with an external monitor i cant see anything right from resolution or colors side.

Is this normal? there is nothing wrong with graphics card the discrete and the integrated are perfectly working i cant just get passed this issue though.. 

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