Same Problem Fixed
I had the same problem... Turns out, my phone still wasn't quite in DFU mode... I held the Power and Home button for about 10 seconds (until my pc "beeped" from picking up a new device), then let go of the power button and still held on the home button and it immediately worked... Looks like even though Limera1n thought the phone was in DFU mode, it actually was off...
Anyway, that worked for me...
Hope this helps...