FIX hdmi not working after upgrade to windows 10

Follow these methods and check if it helps:
Method 1: Check if you are able to see the TV as output under Display Options.
Follow the steps given below.

1. Right Click on Desktop, click on Personalize.
2. Click on Display present at bottom left corner and then click on Screen Resolution.
3. Click on drop down menu present in from of Display.

Check if you are able to see the TV name here. You can also follow the steps given below.
After you have done the connection you can press Windows Key + P, You will see a list at the right side of the screen, and you need to select Duplicate from the list. Check the issue and move to next method if you still face this issue.
Method 2:
By default Windows does not route sound over the HDMI output. To change this we need to change the settings in control panel.  
Note: This will turn off sound from the speakers or normal audio output on the laptop. To get that back you will have to reverse this process. 
a) Press Windows key + X Key. Click on Control Panel
b) With the Control Panel in Control Panel Home view please click on Hardware and Sound.
d) Where it says Sound in green letters there are three options below that are in blue click on Manage Audio Devices
e) This will bring up a window labeled Sound
f) On the Playback tab there is listed the sound options available to you. One should read "Digital Output Device (HDMI) Click on that.
g) There should now be a check mark on that option, make HDMI sound output as set as default.
h) The Sound should then play through your HDMI hookups to the TV.
Write to us with the status of the issue.

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