You should check whether HDMI cable is correctly inserted (on your PC and monitor/TV). Unplug the HDMI cable from your computer/TV, reboot your computer, and reattach the cable. You should also inspect that the HDMI ports (PC and monitor/TV) aren’t covered with debris or dirt.
![](https://adcod.com/wp-content/uploads/2022/09/why-is-my-pc-not-reading-my-hdmi.png)