This problem is caused by oxidation on the cable tip. All that has to be done is pull the flex cable from the connector on the back of the display and cut off the tip of it. Put a dab od antioxident on the cable and put it back in the connector. This has fixed several scanners we have had come through our shop.
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If you can't see the volume increasing and decreasing when you press the volume button and if the menu will not appear when you press the menu button then the television has a problem even though it is brand new. When you have no picture the problem is most likely loose inverters or the inverter board needing to be replaced.
Since you have tried another monitor with your computer, then we can only assume that your LCD monitor had gone bad. If the light is green but you can't see anything on the screen, then most likely the backlight has gone bad. Unless you want to take the monitor apart, I would suggest buying a new monitor.
The backlight has gone (Find a dark place and shine a torch into the screen and see if you can see an image in the background, if you see an image then the backlight has gone) - Needs a new backlight (Engineer to remove and fit) or have a new panel fitted.
The panel has died - Need a new panel
A cable has worked itself loose or is broken
The inverter has gone - Need new inverter
Long shot, the bios has got corrupted - Engineer could re-flash the bios
Long shot, Mainboard onboard graphics has gone - Need new mainboard
My personal opinion is that the backlight or inverter has gone - Either way it needs to be opened up to repair it, consult a service centre and get a quote or repair it yourself if your up for it.