iPhone 4 – Boot loop problem on ios 5.0 – redsn0w Jailbreak

Hi friends, I have a contract free iPhone 4. I was running 5.0 using redsn0w untethered JB. But once, it got switched off on its own. Now, it is blanked when not connected to the PC. But, when is connected to PC, it changes periodically b/w Apple logo and a blank screen. How am I to get back to springboard?? Help would be appreciated.. If I try getting it into DFU mode/Recovery mode and try updating it to 5.0.1 using iTunes, I get error 21...
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