Jail broken Iphone 4 won't restore?

I have an iphone 4 that was jail broken before I bought it, but now it will only turn on if its connected to power. We know its not a battery issue because we put the battery into a different iphone and it worked fine. We're trying to restore it and every time it says "iphone can't be restored an unknown error has occurred (23. It was working just fine last night.

You can try putting the phone in DFU Mode and try restoring it through iTunes. Most of the time this should work.https://theiphonewiki.com/wiki/DFU_Mode

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