You should also inspect that the hdmi ports pc and monitor tv aren t covered with debris or dirt.
Hdmi to vga cable not working on tv.
Unplug the hdmi cable from your computer tv reboot your computer and reattach the cable.
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.
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.
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.
Your title is saying hdmi vga adapter not working so what is it that the laptop is not working with the hdmi adapter or the system is not working need a little more clear info as being a hp laptop you can do a hard reset by holding the power button down until it shuts down then remove the battery and ac power adapter now hold the power.
Problems associated with vga to hdmi cable.
This will refresh your hdmi connection and might fix the issue where your hdmi port is not working.
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.
Today s video technology is moving away from analog for a digital connection format hdmi dvi displayport however there are still situations where you need to change the display technologies usually due to differing ports on a computer and display.