Try Ziphone's refurbish utility, will bring phone back to OTB, HOWEVER....if Itunes and/or the computer wont recognize the phone then I doubt Ziphone will. Sounds like you could have possibly damaged the plug, knocked something loose.
Also, you may have luck at Apple even though your phone is jailbroken. You have a "hardware" issue.....so they may still warranty it....as long as they dont know your dropped it, cause that aint warrantied.
I had a charger toast my circuitboard and they exchanged it even after looking at my cool Summerboard theme
