Error message after upgraded iPhone 4S to iOS 6.1.1.

I upraded my phone tp iOS 6.1.1. on with iTunes last night and got an error message, I don't remember exactly but someting like "an error occured....couldn't be finished". Since then on my phone I just see USB cable and iTunes icon. It can't be connected to iTunes, so I can't restore or do anything else.😕 Anyone knows a solution for this problem? Thanks for your help