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Triple click the home button. Then double tap the VoiceOver off button. This should allow the device to return to normal operation. Then you can reset by pressing and holding both buttons (power and home) until it resets if you need to.
Try doing a hard reset by holding down the home button and the sleep/wake button until you see the apple logo. If the screen continues to flash it is most likely a hardware problem and you should contact Apple to replace the device.
Apple Customer Support
There are two reasons you will not get a display from the mainboard, the first is RAM and the second is Processor. If it is RAM the scren will not light up at all, you might also get long beeps. If the problem is a processor the screen will be blank and nothing will happen.
This is apart from the obvious power supply and screen issues. If you have checked these things it is possible the main board has failed and needs replacement.
the photon charges at the back of the tv might be damaged, try to take it in to be repaired if not i suggest u buy a new one, please, please, please do not take it apart to fix it urself, alot of bad burns have happened to people who try to fix plasma tv's.
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.