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I have connected an external monitor to my Dell N7520 notebook, than been playing with the setting a little on Control Panel\Appearance and Personalization\Display\Screen Resolution

I don't really know what i have done over there, but i accidentally have applied a setting that make the external monitor to show nothing, a black screen basically... trying to fix it, i accidentally applied an other setting that shut down my main laptopn monitor when i connect an external one :\?

to clear it all out, when i connect an external monitor, the main one show black screen and the external one is not functioning at all.. like its blocked?

how can i reset those settings to default?

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  • what happens when you press Fn+F1 (or just F1)?
    – Chin
    Aug 17, 2015 at 20:33
  • @Chin it basically did nothing but, dear god you're awesome! seeing what F1 is doin, when screen when black i have dashed with the keyboard pointers to the third option and hit enter, it fixed it! thanks alot!
    – homerun
    Aug 17, 2015 at 20:41

1 Answer 1

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You can try to press Fn + F1 (or just F1) a few times to toggle between display modes.

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