My Iphone 4s suddenly turned off, and now will not reset. I've done recovery 15 times and each time it says it has failed and prompts me to do it again!  Help!!!

Today my phone was working perfectly, about 2 days after updating to IOS 7.0.3.  I came back to my desk, and then the screen wouldn't turn back on.  After I plugged it into my Imac at work, it gave me the silver apple sign, but then it would turn off, then apple back on, then off... and so on...
I read all of these posts on the community, so I did the reset (did all sorts of variations from 10 seconds to a full minute) seconds while holding power and the home button... nothing.  Then tried a reboot by holding for 10 seconds, letting go of power, and then plugging my phone into my computer which prompted the itunes and plug sign on the screen, which also prompted Itunes to do a recovery.  Went through recovery, and it FAILED.  I've done this cycle now 15 times, on 2 different computers, one an Imac, and one my windows laptop at home.  Tried with an old version of Itunes, and an updated Itunes.... NOTHING WORKS!  Do I have to drive 3 hours to have an apple store look at it???? Help!!

According to this article: http://support.apple.com/kb/TS3694#error21
Error 21- These errors typically occur when security software interferes with the restore and update process. Use the steps to troubleshoot security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
Also, check your hosts file to verify that it's not blocking iTunes from communicating with the update server. See the steps under the heading "Blocked by configuration (Mac OS X / Windows) > Rebuild network information > Mac OS X > The hosts file may also be blocking the iTunes Store." If you have software used to perform unauthorized modifications to the iOS device, uninstall this software prior to editing the hosts file to prevent that software from automatically modifying the hosts file again on restart.
The error on the Mac is odd though. 2100 is not in the article. What version of the Mac Operating system are you running?

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