Windows 10: Screen extension/duplication not working

Hello
I have a Asus desktop, Intel 3.7ghz and HD 4400 graphics running Windows 10 family.
I have just hooked up an HD TV to the HDMI port.
When I use Win+p the sidebar menu comes up and allows me to select duplication, extension etc. but nothing happens!!??
The option I select highlights but the second screen stays blank.
There is no 'apply' button in the menu (though this might be normal).
I've put the graphics pilot up to date but no change.
I've downloaded and installed all sorts of updates; windows, bios, chipset, ...
Nothing has changed the problem.
I've verified that the cable isn't at fault (it works fine with the Blu-ray player).
Here is the paradox:



The TV appears in the list of devices connected but not on the display selection window !!!
(You will have noted that I live and work in France, though this has nothing to do with the problem).
Can anyone help me out here?

:)

 

Screen duplication/extension problems

Is there an option on your TV to change the resolution manually? If there is, can you please adjust the resolution to 1920x1080 on both the TV and the PC?



To adjust the resolution on the PC, please check this
link.



To adjust your TV resolution, kindly check your TV manual or contact your TV support.



Let us know how it goes.

 

Screen duplication/extension problems

Hi Maria

Thanks very much for taking the time.

I'm using an Intel HD graphics 4400 (HDMI*: 4096 x 2304, 3840 x 2160 @ 24 Hz / 24bpp)

The TV is a Philips 4000 series 107cm HD TV 1080p : Entrée num. HDCP + 16:9 + YUV + 1920x1080 min. + 1080p 50/60/24Hz (it's obvious I don't understand any of that, so I apologize if its OTT)

The cable is connected directly. I've not tried another cable but I know the HDMI port is functionning (I've tried other devices) and I know the cable works too on other devices.

The TV is 10m away so its not easy trying other cables without rearranging all the furniture

So, what do you think?

 

I've been told that the Windows updates KB3163018, KB3149135 may have been the cause but after checking, I found they were installed after my problem started. They were part of the various updates I've installed to try and find a solution.
So, I'm still up in the air on this one.
Any other suggestions would be appreciated.

 

Even Intel thinks there is only one screen connected!