iTunes 10 will not recognize iPhone 3GS

I haven't had any problems with this until I upgraded to iTunes 10.1.0.56 and upgraded my iPhone to 4.2.1.  After doing so, whenever I plug in my iPhone, it never appears as a device in iTunes.  I have uninstalled all of the iTunes apps according to Apple instructions (correct order) and re-installed several times, but to no avail.  I have rebooted my computer, turned the iPhone off/on several times, reset the iPhone using the sleep / wake / home buttons and it still will not appear in iTunes.  When I plug in my iPhone to the computer, it is recognized by the computer as an imaging device in Device Manager and pops up a window showing that an Apple iPhone camera has been detected, but it has always done that.

Oddly, I installed iTunes on a Windows 7 PC (which may be completely irrelevant) and iTunes does recognize my iPhone.  I eventually want to move all of my media to the Windows 7 computer, but I want to do one last backup before doing so.  Horrible time for this to happen.
almalerAsked:
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almalerConnect With a Mentor Author Commented:
Oddly, I plugged in my iPhone today to charge it (not to sync it because that hasn't worked since I posted this thread) and lo and behold it started syncing!  I regret to say that I have no idea why it started working.
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splaitCommented:
See if you are running wi-fi sync.  If so, as per the following link, uninstall it and see if that fixes the problem.

http://ihackmyi.com/forum/index.php?topic=28074.0

A number of people are having trouble with this!
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almalerAuthor Commented:
I am not familiar with wi-fi sync so I'm assuming that I'm not running it.  I didn't see anything related to wi-fi sync in the link you posted.
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almalerAuthor Commented:
Googled it and I am not using Wi-Fi Sync.
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splaitCommented:
OK.

Try this:

http://discussions.info.apple.com/thread.jspa?threadID=2567496&start=15&tstart=0

Go to page 2 and read to the bottom.

Let me know if that helps.
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almalerAuthor Commented:
I don't have any external drives hooked up to my machine.  
I have done the steps in http://support.apple.com/kb/HT1925 three times and that has not fixed it.
I had not previously deauthorized and reauthorized, but I just did that and still no luck.
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johnb6767Commented:
In the Device Manager, does it show up as functioning properly?

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splaitCommented:
Have you cleaned out all your temporary files and defragged your hard drive lately?

Have you tried downgrading to iTunes 9?

As I look across the Internet, there are no current solutions to this problem.  Everyone is blaming Apple, and it may well be their fault, but there's no proof of that right now.  You may have to wait before a fix is released.
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almalerAuthor Commented:
Yes, it shows as working properly in Device Manager. Device Manager Screenshot
Splait,
I have rebooted many times today so I don't have much to speak of in the temp folder.  I haven't run a defrag or downgraded to iTunes 9 yet.  I was hoping not to have to downgrade.  I don't believe iOS 4.2.1 is compatible with iTunes 9.
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almalerAuthor Commented:
I ran the iTunes diagnostics and here are a few of the results.  All other tests passed.

 Diagnostics1 Diagnostics2
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almalerAuthor Commented:
I ran a defrag last night and tried again this morning and iTunes is still not recognizing the iPhone.
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splaitConnect With a Mentor Commented:
I spent a bit of time online this morning trying to find a resolution to this.  There doesn't appear to be one at this time.

A number of people have rolled back to a previous version of iTunes, including iOS.

Here are some last suggestions for now:

http://social.technet.microsoft.com/Forums/en/w7itprohardware/thread/84f1f154-ac5e-4369-b430-ccca8319e6da

Go to the second post in the thread and try the solution.

Good luck!

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almalerAuthor Commented:
Thanks Splait!  I will give that a try later tonight when I'm back at my PC.
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splaitCommented:
The only other recommendation I have is to call Apple support.
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clayton89Commented:
Ive seen this problem before, and it was resolved by uninstalling iTunes and doing a reinstall, don't know why but it worked.
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splaitCommented:
Reinstalling has not worked in this case.
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almalerAuthor Commented:
I deleted all the pictures from the iPhone, but still no luck.  :(
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djudd77Commented:
Un-install and re-install iTunes.
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djudd77Commented:
Have you tried another USB port?
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almalerAuthor Commented:
I have uninstalled and reinstalled iTunes and all other related software several times and that has not fixed the problem.  I have used a different USB port as well.  My computer recognizes the iPhone, but iTunes does not.
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monster608Commented:
I've had this same issue as well except i'm using Win7. I've tried everything from uninstalling/reinstalling trying different versions of itunes. I even power my phone off/on and still same results. In the end, i did a fresh install of the OS and now everything seems to work like it should. Use this as last resort.
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splaitCommented:
Well.  I hate when that happens, but at least it works now.  Hopefully, it will be reliable.

Please close this question, and congratulations!
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almalerAuthor Commented:
Thanks for all of your help Splait!
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almalerAuthor Commented:
Thanks for your continued efforts!
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