Hello all you experts

I am not a very technical person
I have upgraded to Windows 10, 2 days ago
and it generally works fine so far, however my HDMI Port will not link with my Television
as it did 2 days ago.

when I plug into the port it makes a sound like something was added (it never did this under 8.1)
but will not connect to my TV. so I am assuming there is an issue with the HDMI Port since upgrading.

I have also trawled through my Device manager and anywhere else I can think of and theres no mention of a HDMI Port anywhere.

Can anyone advise?

it would be appreciated as I am considering a full restore so I can watch TV and my films