Why won't my iPhone 3gs create a backup when sync with my new Mac?

When I attempt to backup my iphone 3gs with my new iMac, it syncs fine but won't create a backup. The apps aren't saving on iTunes so I can't upgrade the phone without losing some apps. I never had a problem with my old PC. Is there something I need to do to authorize a backup on the new computer? I already authorized the computer with iTunes so I could play my music, but I must be missing something with the phone. Please help.

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iOS: Device not recognized in iTunes for Mac OS X
Products Affected
iPad, iPhone, iPod touch, iTunes 10 for Mac, iTunes 8 for Mac, iTunes 9 for Mac
Symptoms
If your iPhone, iPad, or iPod touch does not appear under Devices in iTunes after you connect it to your Mac, refer to the troubleshooting suggestions below.
Resolution
Note: This article is for Mac OS X users. If you are using a Windows PC, please refer to iOS: Device not recognized in iTunes for Windows.
To begin troubleshooting this issue on your iOS device, first follow the steps in the appropriate troubleshooting assistant below:
iPhone Troubleshooting Assistant
iPod touch Troubleshooting Assistant
iPad Troubleshooting Assistant
If the issue persists after following the troubleshooting assistant, continue with the steps below, testing to see if the issue is resolved after each section.
Ensure that your Mac meets the minimum system requirements for your iPhone, iPad, or iPod touch. iTunes 10 and later requires Mac OS X v10.5.8 or later.
Update to the latest version of iTunes and Install software updates on your Mac.
Check USB connections. iOS devices require USB 2.0 to function properly. If you are not sure if your Mac has USB 2.0 ports, refer to the computer's specifications. Disconnect other USB devices, and connect your device directly to a USB port on your Mac.
Restart your Mac.
Mac OS X v10.6.8 or earlier only: Reinstall the Apple Mobile Device Service.
Additional Information
In rare circumstances, your device may be recognized after reinstalling iTunes, but after you restart your Mac, the device may not be recognized again. If this happens, and you are using Mac OS X v10.6 (Snow Leopard), please follow the steps in this article.

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