My jailbroken iPhone 4 keeps?

Turning on and off on its own. I was ready to upgrade the ios and give up the jailbreak, so i did so by plugging my iphone into the computer and upgrading my ios via itunes.halfway through it says it failed for an unknown reason, and then the phone went into recovery mode. I then used redsnow to try and get out of recovery mode, which also failed at some point and now the phone just turns on and on all on its own. I have tried using redsnow to just boot, to escape recovery mode, neither works. I sometimes can get the phone to shut all the way off, but never all the way on. My phone is always either off right now, or on then off. I only ever get as far as the apple logo.

Ideas anyone? I even tried restoring it through itunes, but that failed as well.

Iphones that were jailbroke on 5.1.1 can't update to ios 6, it will brick it.

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