HT4993 my scrren is black but sound is coming out and holding down the lock button and home button doesnt work

I have a Iphone 4s and it is currently updated to the newest software which i believe is IOS7.2 and the screen is black but sound comes out, but it sounds like my vloume is halfway turned up. i can recieve calls and send out calls, i just cant see through the screen. And i tried charging it and i tried pressing down the lock button and the home button, but still nothing seems to work.

Device Not Recognised
For PC
http://support.apple.com/kb/TS1538
For Mac
http://support.apple.com/kb/ts1591

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