IPhone 3G unable to sync with Mac.

My iPhone 3G running 3.0 is unable to sync or charge with my MacBook Pro.
The phone will sync alright with any other computer in the house, just not this one. I have tried uninstalling, then reinstalling iTunes. It most definitely isn't any of the USB ports on the computer, all other USB devices work perfectly. The phone will only show up in iTunes when put in DFU mode. When attempting to restore the phone in DFU mode it downloads OS 2.2, During the restore it later gives me a restore error message (20).
I then tried to restore the iPhone 3G on one of my Windows machines, it worked, it installed 3.0 as opposed to 2.2.
When trying to plug it into the MBP again, it's a no go. I just don't get it, it worked just fine until I decided to backup my phone yesterday, it never would show up in iTunes. The phone shows up in system profiler under USB. The phone also seems to charge and sync during the startup of the computer but then just cancels as if never connected.
I'm also running the latest version of iTunes and OS X.
Any type of help would be greatly appreciated!

Hi,
Try resetting the SMC on the MacBook Pro as described here: http://support.apple.com/kb/HT1411
If the issue persists, it may be related to a 3rd-party software. You can generally disable the software causing the conflict by logging into another user account or temporarily moving the /Macintosh HD/ Library/StartupItems folder, as described here: http://support.apple.com/kb/HT2602
If there is a conflict, you'll want to contact the software vendor for updates, uninstalling or troubleshooting tips.
-Jason

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