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Disconnect the monitor and reconnect the HDTV to test it (if possible)
If the problem is HDMI, disconnect the cable from your TV and reconnect it to another device. For example, if you have an Xbox or PlayStation that uses HDMI for video output, try connecting them directly via USB instead of using an adapter. You should also ensure that both devices have power on them.
If this does not work, we can try two other things: replace your video card or change your display port connector on the computer itself.
Check CMOS reset.
There are several reasons why your video card’s display may not be working.
The most common and straightforward solution is resetting the CMOS (Central Mechanical Override) settings in your computer’s BIOS. This can be done by turning off your computer and then holding down the Power button until you see a flashing light on the front of your laptop near where it says “CMOS.” Once this happens, release both buttons and wait for about 5 seconds before powering on again. If all goes well, you should see that famous green screen again!
Replace the video card if your computer will turn on without powering off the power.
If your computer turns on without powering off, it’s time to replace the video card.
The first thing you should do is check the CMOS reset. This can be done by pressing and holding the delete key while turning on your computer. Once in setup, select ‘Reset’ and then press enter or F2 on the keyboard if using a laptop running Windows 10 or 8.1 operating system; otherwise, select ‘Delete’ and press enter or F10 if using an older version of Windows like 7/8.
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