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That sounds like it might be a mainboard issue with the TV then, since it is not recognizing any HDMI input source. You could try the following: Unplug (do not just turn off) the TV overnight, then...

What manufacturer of HDMI cable are you using? If you are using one from a reputable manufacturer, it should be OK, but if it is a brand X cable, it might be faulty. In any case, you can try a...