Why will my screen not turn back on after powering down iPhone?

When my AT&GT 64gb iPhone 4s turns off, or dies, for some reason when I try to turn it back on, the phone itself turns on but the screen doesnt. Sometimes the screen will be a bright white, sometimes it will appear as if the LCD is cracked, and sometimes its just straight black. Eventually (like up to 12-15 hours later), I somehow manage to get it turned back on like regular, and it works fine (however occasionally, there is a white circle that surrounds the middle of the screen. Anyone have any clue whats going on with it? I'd just get the LCD replaced, but it only doesn't work when the phone turns off and back on, so i don't know if that would help at all.

So u Have restarted it on the ipod?
and you have turned it off and on?
have you tried on your laptop or mac?

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