Unable to switch on iPhone4

Hi, I have been using my I phone 4 8Gb for the last few months and it was fine.. just now maybe 10 minutes back it shut down by itself and would n`t restart. Well the battery was around to 90%.I tried switching in on again but it is not starting up. Also tried plugging it into the charger.took out the Sim card and placed it back again. tried all... if anyone out there friends do know about it please do help me..well it was not in contact with anything harmful. it was just in my jacket pocket.
Somebody please help me.

Have you tried to reset your iPhone by pressing and holding the sleep/wake button and the home button for 10-15 seconds until the Apple logo appears, ignore the red slider.  Then turn back on. You won't lose any data doing the reset.

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