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Sounds like you are having a video issue on the motherboard and that is not a software or easy fix. Most people have to change out their motherboards when it comes down it in regards to this type of activity.
I had a similar problem with my HANNSLounge 32", the screen switched on with green light but none of the front panel buttons worked (screen is black apart from showing the input source in the top left).
After powering off numerous times I tried starting up with a blank SD card in the reader and the tv cycled between red green and blue screens and then reset itself. (Some sort of firmware restore?) After which point I had a working screen again! (Will have to see how long it lasts for!)
Use a reset sequence on the monitor-
1. turn off monitor
2. unplug power
3. plug power back in, holding down the last button on the left, then push
the power button to turn back on and off three times, holding on the third try
until it comes on- hold for ten seconds and release; the monitor should work
Most likely - the CCFL backlight is not getting the power it needs to come on. You can verify by shining a light on the front surface of the set - if you can just make out a dim image, then that is it. On some sets, the CCFL can be seen through the vents on the rear.
Explicit enough to see that's this a a repair shop job. That also probably means a replacement- cost of which will not be much more than repair prices.
One thing how ever- the power supply[which would appear to be the problem] is this built into the screen [that is does the screen have mains power direct? Or is it powered from an external 'Power Brick'
If it is of the Power Brick type - then a new power supply is the answer - get on of the stabilized universal type with a fistful of connectors and a voltage selector switch.