u/Mottok76 Hi! Thanks for reaching out, and we hope you're doing well. Can you see any damage on the HDMI port of your laptop? Kindly try to use another HDMI cable and check if you're still having the same issue. Please keep us posted how it goes. We'd like to extend our help. Rai_Lenovo

Hello, First, please make sure that the HDMI cable is securely connected to both your laptop and your TV. If the cable is loose, it may cause connectivity issues. Next, please try updating the graphics driver on your laptop. You can do this by going to the Lenovo website and downloading the latest graphics driver for your laptop model. If updating the graphics driver doesn't work, you can try rolling back the Windows update that caused the issue. To do this, go to Settings > Update & Security > Windows Update > View update history > Uninstall updates. Find the update that caused the issue and click on Uninstall. Check if this issue persists. Best Regards, Hania Lian

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Was this all working fine with Windows 10?

I'm having the same problem after installing Lenovo firmware update. Tried all the solutions listed (reinstalling thunderbolt, bios, hard reset, system restore to previous update) and still no solution.. putting this comment here if anyone has found 6he answer

Hi! · This can be caused by multiple thing! · Do you know if the hdmi port has worked prior? Have you in the past dropped you laptop or spilled any liquid on it? · First of, please verify that the external monitor is working. That it is powering up, and that another device can connect and display to it. Preferably using the same hdmi port in the monitor. If this don't work, please try: · Another cable · Another port in the monitor · If there were any issues with above, please try the new cable / port with your laptop and see if this works. If everything works with the monitor, then it is probably the a laptop problem. · We'll now check some potential hardware issues: · Check if the hdmi port looks broken. · Do you see any debris? If you see debris, please clean it out with something like a (wooden) toothpick or something similar. · Do you see any 'goo' or corrosion? · Do you see any bent pins, or any burn marks? Then the physical port is likely busted, and unless you can re-solder a new port on the motherboard (which is an advanced procedure) then replacing the motherboard is the only solutions, which sadly may not be practical. · We will now check some software issues on your laptop, keep your monitor plugged in with these steps: · Restart your laptop. · Please make sure you have all your drives, firmware, bios and windows up to date. You can find your device drivers on Lenovo's support page. Don't forget to restart your laptop! · Please go into your windows settings, enter system settings, and then display (may slightly differ on windows 10). · Can you see multiple displays there? If yes, then you should have multiple display options, on: · Windows 11, Display settings: at top of the page, in the bottom right of the display layout box, you will see options such as Disconnect this display, next to the Identify button. Press this , then you should get a drop-down menu, please select Extend desktop to this display. · Windows 10, Display settings: Scroll down to the Multiple Displays sections, there you have a box that may say Disconnect this display. Press this Disconnect this display box, then you should get a drop-down menu, please select Extend desktop to this display. · If neither of above solves this, you may want to open up the laptop and inspect the motherboard, especially around the hdmi connector area if you see any disintegrated components, any burns or corrosion. Here is a link to a motherboard disassembly for your model. If you find something problematic, you'd most likely need to replace that component to solve the problem (and that may still not fix it), which would suddenly transform this into an advanced repair. You may also take a picture and upload for us to see if you want, then please see this guide Adding images to an existing question. · If neither of this works, please respond and we will see what we can do! · Good luck, · Cheers