FN + F8 for Dell E5480 to extend display not worki


Good day!
Need assistance for FN + F8 for Dell E5480 to extend display to an external monitor not working. when i press and hold FN + F8 it's not showing anything though it works for switching the Wifi On and Off.
Thanks in Advance

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Registration date
Monday June 3, 2013
Last seen
December 11, 2018
Thank you
What operating system is it? Once the Operating has booted, it has control. If it is window 8+ hit the windows key+P, and select!
It's running on Windows 7
is there other way or work around to activate the extended display and detect the external monitor?
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