I was using yahoo messenger on my iphone 4 when it suddenly stopped working and my phone shut down and now it wont turn back on

i need help with my phone,
i downloaded yahoo messenger for my iphone 4... i used the app for about 10 mins then it crashed and will not turn on.. the screen is lit, but is black, ive tried plugging it into my computer but nothing is happening, ive holding down the home button and all that, and still nothing.
someone please help me out

i put that i held down the home button and all that... sorry, should of made my message a little clearer hun.. but i did try that, ive been searching video's on the net trying to figure out how to fix the problem, but nothing seems to be working... ive just tried pluging the usb lead into my phone while holding the home button then connecting it to my computer to see if itunes fires up, but even that didnt work... i dont know what else to try.

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