Imac Screen gone black

Helpppp! My Imac screen went black or rather does not come up after the start up sound. I should say this was during a thunderstorm and I think I heard the spark of electricity around the system and shortly after the contents on screen became distorted. I put off the system and the display no longer comes on. Please come to my aid.

Thanks for your help BDAqua but I'm afraid the situation remains the same even after trying out your suggestion. I have taken a photo of the screen with my phone and this is photo is the best the screen can do. I hope it helps in diagnosing the problem

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