After I've used my laptop connected to TV via HDMI cable, my laptop's monitor doesn't show any image. It's working because (sometimes) I could see the loading screen, but I don't know how to fix it! At the moment I'm using my TV. However, I wanna use my laptop's monitor. Including, I can't format this, because I don't see my BIOS.
I’m sorry, my English is poor. I can use my laptop normally just connected to TV. However, the television only starts displaying images from the loading screen, so I can’t access the BIOS.
You really need to remove all those bad repositories and then run a proper upgrade.
Open Software & Updates and remove any repositories there that are showing an error in the "sudo apt update" results.
Once they are removed, run sudo apt update && sudo apt upgrade.
In the meantime, can you please shut Down the notebook completely. Make sure it is powered off and unplugged.
Take a q-tip
and gently clean the HDMI port on your notebook thoroughly. You can use a small drop of Rubbing Alcohol but don't get carried away and soak your machine.
If you have a spare HDMI cable, this is a good time to test with it.
Some HDMI Cables are Directional - one end is for the computer and one end is for the output. They cannot be reversed. So please Check Your Cables.
Power on the notebook and see if any graphics appear.
Then plug in the HDMI with the notebook still on and see if the TV displays the graphics. If it does, select shutdown in the app menu and then immediately unplug the HDMI before the computer shuts down.
Boot without the HDMI cable and test graphics on Notebook monitor.
You have multiple of the same entry in sources.list.d
Really, just removing the extra bad entries and then running update and upgrade should be all you need to do.
All of the repositories listed with a W: warning in the terminal.
You may try opening a new terminal and running
sudo -i
nautilus
Then navigate from the left pane to "Other locations" > "computer" > /etc/apt/sources.list.d
And look at the actual files within the directory to get a better understanding of what you are seeing.
Right click the Microsoft-Edge-Beta.list and the Microsoft-Edge.list files. From the context menu, select "Delete".
Close the window. (You can close the terminal you ran "nautilus" in, it may want to finish before it closes.)