Iphone 4 suddenly turned off and cant turn on

i was using my iphone 4 (using only yahoo messenger app) no other apps running when suddenly the screen turns into different colors and then into totally black screen i believed it was turned off. i have tried the long press on wake up button also the home and wake button long press but none of this work. please help. i need help badly.thanks

Did you try to connect the iPhone to iTunes? http://support.apple.com/kb/HT1414
Was the iPhone jailbroken?

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