Usb-c to hdmi not working

[akmonk42]

USB-C TO HDMI isn't working. I used to just plug and play. Now, NOTHING! I have purchased a couple new cords. Yet still, NOTHING! ANY SUGGESTIONS? 

PLEASE AND THANK YOU!

[Teatotaler]

Check your auto-blocker restrictions in your security and privacy settings. Are they on maximum? In a recent update, they cranked the security way up.