How to fix this problem with iPhone4s, got blue dark display screen with black lines?

My iPhone 4s since i bought it in Dec 2012 was working smooht, today got dark blue screen with black lines, touch screen on dealth can't work or any, I tried to trun it off to restart but can't,
Until now I can't find a solution, I have not droped ever in my life so i don't know what is wrong with it today? And the warranty time of 1 year has expired already,
what to do with this issue? Anyone experienced a such matter before?

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