Stuck in Black Screen? (Tried everything; DFU, Sleep+Home...)

(my iphone iphone 4 16gb ios 5.01 , jailbreaked redsn0w)

so... around week ago cousins messing phone during family trip , kept putting password wrong until phone got locked until connected itunes. when came trip tried connecting mbp didn't recognize phone because had formatted , although had passed itunes data including backups , settings, hadn't synced iphone yet after format. went on icloud.com , remotely wiped phone find iphone , restored itunes ios 5.1.1(i going update 5.1.1 anyways decided now). after restoring data phone, attempted jailbreak absinthe. jailbreaking failed twice managed make work. seemed fine while after hour or so, turned off though @ 20% battery. tried turning on again didn't work tried holding sleep , home buttons few seconds no avail. had go out left connected wall charger when left. when came back, pressed sleep button few seconds , turned on critical battery screen(red empty battery), left while charging , worked, until turned off had before again. , that's i'm @ now. have tried everything! tried holding both home , sleep buttons minute few times, tried put in dfu mode 10 times, itunes won't recognize it, silver apple doesn't appear. tried connecting 2 other computers nothing worked, i've been trying past few days, i've tried charging 4 different chargers nothing works, i'm going take apple store on monday since jailbreaked it, don't know happen. please me, i'm desperate... i've been searching internet days answer nothing works. iphone isn't old... think i've had around year.

 

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