My iPhone 3GS got wet a couple of weeks ago. I dried it off and it has been working ok. Then today it just died. Went from fully charged to no charge to dead. When plugged into the mains it shows the white apple sign on a black background, and vibrates interminently. When plugged into the computer nothing happens and iTunes does not recognise that it is plugged in. My last back up was done a few months ago but I really need to retrieve my contacts and calendar appointments from it. Any ideas?