Hello. I tried steps from the article http://support.apple.com/kb/HT1747?viewlocale=en_US&locale=en_US, but no success. I removed /System/Library/Extensions/AppleMobileDevice.kext, iTunes, restart, download and install iTunes, restart, start iTunes. In Activity Monitor is still no AppleMobileDeviceHelper process and iTunes don't see my iPhone and iPad. Any suggestions?