Just tried syncing my iphone 4 but is not recognizing in itunes. It's connected directly to the USB port, the cable is not defective as it does charge the phone. This is the first time I've tried syncing since upgrading to 10.6.5 and itunes to 10.1. I've tried restarting the phone and the imac. I've seen numerous posts about this issue around but no definitive answer. Any help is greatly appreciated.