Ubuntu does not recognize HDMI port [closed]

If you are trying to do a dual display, look into your "System Settings" for "Screen Display". There is usually a setting for "mirror display" (same thing on both screens) or "extend display" (have your desktop use both screens). On many installations, these don't turn on just by plugging a 2nd screen in.

If this is a single display and you are trying to replace a monitor by a TV, make sure that:

• your TV can handle the resolution and refresh rates that the graphics card is trying to output
• your TV is set to the correct HDMI outout that you've plugged into (my TV has 4, and you can cycle through them using the "input" button on the remote)
• try another HDMI connector on the TV
• make sure your graphics card is sending a signal through HDMI. You may need to edit your xorg.conf file for this, see details here.