I have the same problem - updated iphone 4 to IOS6 via wifi - then synced with itunes. No probs. Then tried to sync ipad with itunes - got an error code and now ipad stuck in recovery. Itunes wont recognise that my ipad is connected so cant restore (does recognise my iphone)
Cant actually power off...
Tried holding down on off and home together for 8 seconds - get 'flash' then apple then back to the recovery screen (with usb and itunes emblem).
Tried holding down home button whilst plugging in USB
Tried this numerous times
Any ideas? Cant get a genius bar appt as shops inundated due to iphone5...:-(