My iPhone4 doesn't show up in iTunes

heyy guys just follow the above methods..... 1. Disconnect your iPhone from your Mac.
2. In the Finder, locate iTunes in the Applications folder and drag it to the Trash.
3. Move the iTunes icon to the Trash.
4. Choose Go > Go to Folder.
5. Enter /System/Library/Extensions and click Go.
6. Locate the file AppleMobileDevice.kext and drag it to the Trash.
7. Choose Go > Go to Folder.
8. Enter /Library/Receipts/ and click Go.
9. Locate the file AppleMobileDeviceSupport.pkg and drag it to the Trash. If prompted, authenticate with the administrator password.
10. Restart the computer.
11. Choose Finder > Empty Trash and restart the computer.
12. Download and install the current version of iTunes.
13. Connect your phone to your Mac again and open iTunes

Deleteing iTunes for this seems rather brutal. Not to say it does not do the job.

But does someone have finer knowledge of how to fix the indicated problem ?

I had something like this happen to my MacBook pro. But all I did was try a different USB port and it worked. But if your still having issues have you tries restarting your MacBook?