HDMI on Laptop

Things to consider:

• The display configuration is up to the operating system to decide.
• The BIOS most often doesn't output to anything but the primary display.
• Windows (and other operating systems) feature multiple modes of "display projection", one of which is usually  "PC screen only".

Your list of debugging steps to try in order should be:

1. Use the Win+P (Super+P) shortcut while the laptop is booted, in hopes that it's a problem caused by display projection (Note that you will also need to select another mode, meaning this shortcut will have to be used in the form of Win+P+2+Enter (specifying the option out of the list, or Win+P+ArrowKeyUpDown+Enter to navigate within the list),
2. Boot into another operating system, like a GNU/Linux liveboot distribution, in case it's a problem with your current OS's display configuration,
3. Disassemble the laptop and physically unplug the display (Usually eDP connector) of your "broken" internal display, to remove it as a possibility of a primary display.

Why'd you connect a Laptop to a TV screen :skull:

@67078it is useful for stuff like PowerPoint presentation 

Here is a simple explanation

Step 1: make sure your laptop and TV both have an HDMI port 

Step 2: turn off your laptop 

Step 3: turn on your TV 

Step 4: plug in the HDMI cable to both your laptop and TV

Step 5: turn your laptop on and close it 

Boom its now projecting to your TV, make sure you have a keyboard and mouse.