iPhone Recovery/DFU mode problem!

i have jailbroken iphone 4, , today randomly turned off (i know fact battery not low). tried using redsn0w boot, didn't recognize iphone. iphone stuck on apple logo. tried putting phone recovery mode itunes, when hold down sleep/home buttons, apple logo disappears, reappears couple seconds later. pretty much, i'm stuck on apple logo , not able phone dfu mode or recovery mode.
help!

 

been there... done that.

use ifaith.... has built in dfu pwner. while u save shsh blobs.

 

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