If you have an hdr enabled device such as a uhd blu ray player or streaming device connected to an hdr compatible tv it s possible that the tv is not recognizing the hdr encoded content.
Hdmi to vga cable not working on tv.
Unplug the hdmi cable from your computer tv reboot your computer and reattach the cable.
Problems associated with vga to hdmi cable.
Video signals may be adapted in either direction hdmi to vga or vga to hdmi but there are certain limitations and expense differences.
You should also inspect that the hdmi ports pc and monitor tv aren t covered with debris or dirt.
This will refresh your hdmi connection and might fix the issue where your hdmi port is not working.
Set your hdmi device as the default device.
If both the above elaborated methods didn t fix your problem of hdmi not working on windows 10 then you should try to check if your hdmi device is set as the default of not.
If you haven t already swap out your hdmi cable for a hi speed hdmi cable with a speeds of at least 10 2 gbps but preferably 18 gbps.
This process is a must if you are running a presentation that still operated with a video graphics array capacity in a high definition multimedia interface world.