First, verify that your computer is sourcing video through the HDMI port rather than looking for an input from it.
What happens if you try to select an HDMI input on the TV with no HDMI cable connected? It should select the port, then complain about "No signal." If you get that, turn off the TV and computer, connect the HDMI cable, turn on the TV first, then the computer.
There are certain HDMI input chips on the market that are very vulnerable to static electricity damage, and some cheap HDMI switches will conduct a static discharge from the switch mechanism to the HDMI lines (a friend blew two chips that way, then he realized both times the input went out when he used the switch). Use a direct cable connection if possible, and avoid putting a fingertip into the free end of an HDMI cable when the other end is the only one connected. Symptoms of static electricity damage may include "no signal" when an active signal source is connected, or some sort of data format error message. I don't know if your TV is programmed to lock out bad ports; I would think there would be some sort of fault indication to go with the lockout.
SOURCE: No HDMI input socket on Toshiba 'HD Ready' TV
There is an easy way to adapt the cable.
Any good computer shop will have the adaptor.
Take the HDMI cable to them, and tell them you want an adaptor to go to composite signal.
(I know that they're made, many of the graphics cards I use to build computers come with that cable adaptor)
You also might try Best Buy or Radio Shack, but you might not have much luck with them.
SOURCE: Insignia 37 inch lcd inputs not working except for hdmi inputs
TV when hooked to Direct TV by HDMI will not work, it must be hooked by RCA cables. I now have 1080i rather than 1080P. The HDMI cable and the direct TV box has been changed. What can the problem be?
SOURCE: "No Signal" Message when using HDMI Inputs on 26" Proscan LCD TV
You MUST get HDMI Driver for your Video Card, it is NOT standard. You need to go to PC makers web site and download latest Video Divers for your PC, then you must set up Multiple Desktops, To do that you must first connect the TV, but leave OFF, connect up to PC, reboot, setup Video Card, turn ON TV, TV will have already been detected, On PC, Share the desktop, or Clone, whatever you wish, now reboot after saving settings. Now you set the TV for HDMI already and it should show you a desktop when chosen. You must select and setup TV, FIRST, then connect the PC. From then on, Turn the TV ON, then turn the PC ON, that way it will Always detect the HDMI port.
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