White Screen/Black Screen/Stuck in DFU (error 21) - Help!

My iPhone cannot be restored. Everytime I try, I get error 21. I've tried on 3 different PCs, my mac, I've tried with iTunes and even some jailbreaking software. It will not restore. Anything else I can try?
Here's more detailed info:
My battery was low (it was on the screen where it tells you to plug it up and won't function) on December 24 so I left my iPhone at home, charging on my mac while I went out to eat. When I came home, it wouldn't go back on or rest (home + power). I hooked it back up to the mac, thinking it wasn't charged and it said it was in DFU mode.
I tried to restore it and said "error 21." I did everything I read on the Internet (set up a different user account, tried to restore from there, deleted iTunes, tried a new USB cable, tried several computers) and then I tried to install a jailbroken version of the OS on both the mac and PC, because I read that works, but it didn't work either (actually, the software I used goes through iTunes, so I still got error 21).
The phone had the latest version of iOS 4 on it and was not jailbroken before. I cannot take it to a genius bar. The nearest genius bar is a 12 hour drive.

http://support.apple.com/kb/ts1275
iphone error 21 - Google Search
<Link edited by host>

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