My iphone 4 is stuck on apple logo, why: WHY

I try to jailbrake it last night and unplug it by an accident: x i just turn off and when i try to turn it on the apple logo came up like always but this time it won't acculaty leave or the phone dint want to turn on why. How can i fix it? ( P. S) a friend of mines try to help me but he count cuz my power button dosent work:'. I have a computer with itune can i fix it with:_) please help please someone

If you jailbroke it on 6.1.3 or higher, its teathered and need to be hooked up to a PC and rebooted with redsn0w

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