IPhone 4 restarting problems when syncing with iTunes

I know been done before, just to clarify some things is that though some answers are correct to a percentage.
First one needs to try another USB and another PC or Mac for clarifying that its not a problem with the iPhone itself. I found this out when I had this problem and well I tried another USB port and working fine now.
Disabling USB ports through device manager can get results - however you may be adding additional problems - the problem is associated to the hardware of the computer (mac or pc) and this is either software related with drivers or hardware related and the USB port is stuffed - connecting any device to this port can result in failure of that device. Identifying the USB port is at fault can help you in many ways to overcome other hardware faults on your computer - seriously this isnt just about the iPhone but more to the point saving your computer from damages.
Due to many viruses and software codes - identifying if the problem is hardware or software based can be tricky, even with aid of programing benchmark programs, the only real way to know if it is hardware and not software is that doing a complete reformat - really this is the quickest and most surest way of clarifiication - you can spend days on end trying to identify where the fault is through programs and stuff and really you may not get anywhere - so reformating the computer and complete reinstall will determine if it is a hardware fault - now if it is hardware fault then it can either be the port itself, the motherboard or the power supply going to that port - so best be sure to back up everything and safegaurd all your hardware componants inside the computer as if it is a motherboard or power supply you really down want all your hardware becomming faulty due to surges or even meltdown.
Now if the iPhone is going faulty on other USB ports of other computer systems then you really need to contact your supplier if under warrenty or have it repaired - unless you personally know how to repair them. I have read a few threads here and they are archieved so really no one that I know of has covered this answer I am applying now. so if there is a failure to syncing through iPhone turning off and on then really cheack out the computer and iPhone (iPhone on other USB ports and other computers) and protect your data.

I have similar problem. Played podcasts becomes UNPLAYED after synch with iTune.

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Fixing iPhone error 13019 when syncing with iTunes 8.2

There is a bug in 3.0. Recently i discovered that when i tried to sync voice memo to itune, I hit this error message of "The iphone "My iPhone" cannot be synced. An unknown error occurred 13019". I tried to wipe off every music from my iPhone and re-sync back from iTune and it still hit the same error. Tried to uncheck the voice memo, and it resolve.
I hope the upcoming release will resolve most bugs including this one.

Thanks for posting your fix/work around for this. I had a voice memo from three days ago that had sync'ed with my Mac two days in a row now with no problem. This morning iTunes kept giving me this unknown error 13019 dialog.
I simply unchecked the single voice memo sitting in my Library, and the next sync worked without any errors. NOTE: I do have sync prefs for my iPhone set to "Sync only checked songs and videos".

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I had done all of that to no avail. I did call Apple Tech Support and after he suggested I try a USB port in the rear of the Win 7 computer, things starting working again. I had tried switching the USB port at the front of the machine but that had not helped. Everything is good to go again. thanks for your reply

IPhone loses play counts when syncing with iTunes

I would like to repeat the question from this thread, which has mistakenly been marked "answered".
When syncing with iTunes, not all play counts are transferred into iTunes. When I turn the iPhone off, it even forgets the complete list of played songs (it is even deleted from iTunes itself).

I have similar problem. Played podcasts becomes UNPLAYED after synch with iTune.

I purchased two songs on my iphone and it did sync with itunes. Then i put the two new songs in a music folder and it won't sync the songs to the folder on my iphone. same phone same computer never had this problem before.

i purchased two songs on my iphone and it did sync with itunes. Then i put the two new songs in a music folder and it won't sync the songs to the folder on my iphone. same phone same computer never had this problem before.

In iTunes, try signing out of your Apple ID & then back in: click on iTunes Store on the left sidebar of iTunes, click on your Apple ID on the top right, sign out, sign back in. Then try to sync your purchased music to your phone again.

I've just signed up to iTunes Match as I have songs on my iPhone 4 which wont sync with iTunes as they are from CDs but I can't see my music in the cloud now. Anyone had the same problem and have an easy fix?

I've just signed up to iTunes Match as I have songs on my iPhone 4 which wont sync with iTunes as they are from CDs but I can't see my music in the cloud now. Anyone had the same problem and have an easy fix?

What fixed it for me:
On your computer, open iTunes > My iPhone (or whatever name you gave your iPhone) > "Music" page
Uncheck "Sync Music"
Click "Sync" button (bottom right)
Let it run and finish
Uncheck the box for every song, playlist, etc.
Click "Sync" button (bottom right) (This step may be unnecessary, but I did it and got the result I wanted.)
Let it run and finish
Check the boxes for the music you want on your iPhone
Click "Sync" button (bottom right)
Let it run and finish
See if that doesn't work for you. I tried a lot of things that did nothing, but this seems to have fixed it, and quickly.

When syncing with itunes, got error message saying had error and now ipad2 will not do anything other than showing the USB cable with arrow pointing to Itunes on screen. have done the reset and restart, but still get same thing.

when syncing with itunes, got error message saying had error and now ipad2 will not do anything other than showing the USB cable with arrow pointing to Itunes on screen. have done the reset and restart, but still get same thing. Ipad does not show up in itunes even though cable plugged in. Have shut down and restarted Windows 7 computer.

I had done all of that to no avail. I did call Apple Tech Support and after he suggested I try a USB port in the rear of the Win 7 computer, things starting working again. I had tried switching the USB port at the front of the machine but that had not helped. Everything is good to go again. thanks for your reply

Iphone 4 will not sync with itunes. I tunes will freeze when it says waiting for sync to start . I can not put any media on my device ! please help !!!

Please help me figure out why my iphone 4 will not sync with itunes. I wish to prevent wiping the device clean if possible.
thanks,
Brian

I have had exactly the same problem before, I have followed the guide as suggested to the letter and still no joy, each time (3 times now) that I have reinstalled the latest version of iTunes it is recognised and syncs with my iphone but with the next reboot of my computer it is gone again.
Try to refer this article about [how to transfer iPhone contents to computer|http://www.softwarebbs.com/wiki/Howto_transer_or_backup_iPhone_contents_toPC].
Hope it works you out.

My iPhone 4 won't sync with iTunes.

My iPhone 4 won't sync with iTunes
I am running iTunes 11.1.5.5, and my phone is using iOS 7.1
Windows 8 recognizes that the phone is connected, and even asks if I would like to download pictures, however iTunes will not.
So far, I have stopped and restarted AMDS, iTunes, my laptop, and the iphone. None of these have had any success. I've tried using a different cable, but the results were the same. The phone can download songs via its own iTunes app, but cannot sync with iTunes on the laptop.
How can I get my phone to start syncing with iTunes again? This problem occurs sparatically, sometimes syncing and sometimes ignoring the phone altogether, like it is now.

Does your Mac meet the requirements for the latest version of iTunes?
Macintosh System Requirements
Mac computer with an Intel Core processor and 512MB of RAM
OS X version 10.6.8 or later
Safari 4.0.3 or later
400MB of available disk space
Broadband Internet connection to use the iTunes Store
In the future, you're more likely to get faster, more appropriate responses by posting to the correct forum. The iPhone Hardware forum is not the correct place to be posting issues regarding iTunes on your Mac.

IPhone is lost while syncing with iTunes

Hi there,
for the longest time my iPhone hasnt been very friendly when syncing with iTunes.
It often disconnects, the iPhone plays that "I'm connected" sound out of nothing, then a few seconds later iTunes hangs and displays various error messages like "can't sync the device '', there is none" or so (in German of course, sorry for my bad translation).
Here's what Console.app tells me:
18.06.09 20:56:42 [0x0-0xe00e].com.apple.systemuiserver[226] DigiHub:sendChargingCommandToDevice RequestExtraPower(kUSBPowerDuringWake) returned 500
18.06.09 20:56:42 [0x0-0xe00e].com.apple.systemuiserver[226] DigiHub:sendChargingCommandToDevice sending command with sleep: 0, wake 500
18.06.09 20:56:42 [0x0-0xe00e].com.apple.systemuiserver[226] DigiHub:sendChargingCommandToDevice sending command with sleep: 0, wake 500
18.06.09 20:57:55 com.apple.usbmuxd[404] MuxClearPipeStall Can't clear pipe stall 2. Error: 0xe00002ed
18.06.09 20:57:55 com.apple.usbmuxd[404] MuxClearPipeStall device is gone
18.06.09 20:57:55 com.apple.usbmuxd[404] MuxReceivedUSBData couldn't clear pipe stall (0xe00002cd), giving up on this interface
18.06.09 20:57:56 [0x0-0xe00e].com.apple.systemuiserver[226] DigiHub:sendChargingCommandToDevice RequestExtraPower(kUSBPowerDuringWake) returned 500
18.06.09 20:57:56 [0x0-0xe00e].com.apple.systemuiserver[226] DigiHub:sendChargingCommandToDevice sending command with sleep: 0, wake 500
18.06.09 20:57:57 com.apple.usbmuxd[404] HandleUSBMuxConnect Client 0x10c0f0 (iTunes/com.apple.iTunes) requesting attach to 0x1:32498 failed, no such device
18.06.09 20:57:57 com.apple.usbmuxd[404] HandleUSBMuxConnect Client 0x10c0f0 (iTunes/com.apple.iTunes) requesting attach to 0x1:32498 failed, no such device
18.06.09 20:57:58 com.apple.usbmuxd[404] HandleUSBMuxConnect Client 0x10af80 (iTunes/com.apple.iTunes) requesting attach to 0x1:32498 failed, no such device
18.06.09 20:57:58 com.apple.usbmuxd[404] HandleUSBMuxConnect Client 0x10c0f0 (iTunes/com.apple.iTunes) requesting attach to 0x1:32498 failed, no such device
18.06.09 20:57:58 com.apple.usbmuxd[404] HandleUSBMuxConnect Client 0x10c0f0 (iTunes/com.apple.iTunes) requesting attach to 0x1:32498 failed, no such device
18.06.09 20:58:13 com.apple.usbmuxd[404] MuxClearPipeStall Can't clear pipe stall 2. Error: 0xe00002ed
18.06.09 20:57:57 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: receive_message: Could not receive size of message: 0 Unknown error: 0
18.06.09 20:57:57 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: connect_toport: Could not connect to USB mux port 32498 for device 1: Device not configured
18.06.09 20:57:58 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: connect_toport: Could not connect to USB mux port 32498 for device 1: Device not configured
18.06.09 20:57:58 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: connect_toport: Could not connect to USB mux port 32498 for device 1: Device not configured
18.06.09 20:57:59 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: send_message: Could not send message size: Bad file descriptor
18.06.09 20:58:13 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: lockssl_handshake: SSL handshake controlled failure 0: SSLERRORSYSCALL (Early EOF reached)
18.06.09 20:58:13 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: AMDeviceStartSession: Could not start session: kAMDInvalidPairRecordError
18.06.09 20:58:13 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: sendmessage: Could not send message size 342: Broken pipe
18.06.09 20:58:13 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[460] 460:2684798752|DeviceLinkListener.c:_setMobileDeviceValue| ERROR: Could not start session with device: InvalidPairRecord (92)
18.06.09 20:58:13 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[460] 460:2684798752|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not set tethered sync info (<CFDictionary 0x1fa150 [0xa05101a0]>{type = mutable, count = 2, capacity = 3, pairs = (
1 : <CFString 0x130fb0 [0xa05101a0]>{contents = "DisableTethered"} = <CFBoolean 0xa05103f8 [0xa05101a0]>{value = false}
2 : <CFString 0x1fa1e0 [0xa05101a0]>{contents = "SyncingOS"} = <CFString 0x133e8 [0xa05101a0]>{contents = "OSX"}
)}) in lockdown for com.apple.Contacts (Contacts): -402653092
18.06.09 20:58:17 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[460] 460:2684798752|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not find a device with the target identifier 3c335fe6df52bd23e4723e99731ad5602fe67640. Assuming there are no disabled data classes.
18.06.09 20:58:17 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[460] 460:2684798752|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not find a device with the target identifier 3c335fe6df52bd23e4723e99731ad5602fe67640. Assuming there are no disabled data classes.
18.06.09 20:58:21 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[460] 460:2684798752|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not find a device with the target identifier 3c335fe6df52bd23e4723e99731ad5602fe67640. Assuming there are no disabled data classes.
18.06.09 20:58:25 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[460] 460:2684798752|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not find a device with the target identifier 3c335fe6df52bd23e4723e99731ad5602fe67640. Assuming there are no disabled data classes.
18.06.09 20:58:25 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[460] 460:2684798752|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not find a device with the target identifier 3c335fe6df52bd23e4723e99731ad5602fe67640. Assuming there are no disabled data classes.
18.06.09 20:58:29 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[460] 460:2684798752|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not find a device with the target identifier 3c335fe6df52bd23e4723e99731ad5602fe67640. Assuming there are no disabled data classes.
18.06.09 20:58:29 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: disable_sigpipe: Could not disable SIGPIPE on socket
18.06.09 20:58:29 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: disable_sigpipe: Could not disable SIGPIPE on socket
18.06.09 20:58:29 com.apple.usbmuxd[404] HandleUSBMuxConnect Client 0x10ae00 (iTunes/com.apple.iTunes) requesting attach to 0x2:32498 failed, no such device
18.06.09 20:58:29 com.apple.usbmuxd[404] HandleUSBMuxConnect Client 0x10ae00 (iTunes/com.apple.iTunes) requesting attach to 0x2:32498 failed, no such device
18.06.09 20:58:29 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: connect_toport: Could not connect to USB mux port 32498 for device 2: Device not configured
18.06.09 20:58:29 [0x0-0x25025].com.apple.iTunes[457] MobileDevice: receive_message: Could not receive size of message: 0 No such file or directory
18.06.09 20:58:34 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/Resources/MDCrashReportTool[473] 473:2684798752|IPodCrashReportTool.m:_cancelCopySubmitCrashReports| ERROR: No crash report copier running for target 3c335fe6df52bd23e4723e99731ad5602fe67640
18.06.09 20:58:34 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/Resources/MDCrashReportTool[473] 473:2684798752|IPodCrashReportTool.m:_cancelCopySubmitCrashReports| ERROR: No crash report copier running for target 3c335fe6df52bd23e4723e99731ad5602fe67640
18.06.09 20:58:34 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/Resources/MDCrashReportTool[473] 473:2684798752|CrashReportCopierPrivate.m:-[CrashReportCopierPrivate device]| ERROR: Could not find a device with UID 3c335fe6df52bd23e4723e99731ad5602fe67640
18.06.09 20:58:34 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/Resources/MDCrashReportTool[473] 473:2684798752|CrashReportCopierPrivate.m:-[CrashReportCopierPrivate device]| ERROR: Could not find a device with UID 3c335fe6df52bd23e4723e99731ad5602fe67640
18.06.09 20:58:37 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/Resources/MDCrashReportTool[473] 473:2684798752|CrashReportCopierPrivate.m:-[CrashReportCopierPrivate device]| ERROR: Could not find a device with UID 3c335fe6df52bd23e4723e99731ad5602fe67640
(note: the items after 20:58:17 are after I physically disconnected the iPhone)
This has long been a problem for me (since I had it), I've been re-installing iTunes for several times - it only got better once when I had 8.1 fresh reinstalled, but that's history now since there's iOS 3.0 and iTunes 8.2.
I've also checked this post: http://discussions.apple.com/thread.jspa?threadID=1988855&start=0&tstart=0
The error messages are not quite the same, it also didn't fix my problem. Have removed all stuff from MobileDeviceService and MobileDevice.framework and so on rebooted afterwards, reinstalled iTunes 8.2 - nothing helps - it only keeps getting worse.
What can I do to make my iPhone sync again!?
Thanks in advance,
mat.i.am

Plugged phone in this morning and Console shows the following messages:
7/10/09 7:54:52 AM com.apple.usbmuxd[31] MuxClearPipeStall Can't clear pipe stall 2. Error: 0xe00002ed
7/10/09 7:54:52 AM com.apple.usbmuxd[31] MuxTCPSendRST MuxInterfaceSend failed: 0xffffffff
7/10/09 7:54:52 AM /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[290] 290:2692392736|DeviceLinkListener.c:_setMobileDeviceValue| ERROR: Could not start session with device: InvalidPairRecord (92)
7/10/09 7:54:52 AM /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[290] 290:2692392736|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not set tethered sync info (<CFDictionary 0x30eac0 [0xa03361a0]>{type = mutable, count = 2, capacity = 3, pairs = (
1 : <CFString 0x30eaa0 [0xa03361a0]>{contents = "DisableTethered"} = <CFNumber 0x10f000 [0xa03361a0]>{value = +1, type = kCFNumberSInt32Type}
2 : <CFString 0x126720 [0xa03361a0]>{contents = "SyncingOS"} = <CFString 0x133d8 [0xa03361a0]>{contents = "iPhone"}
)}) in lockdown for com.apple.Bookmarks (Bookmarks): -402653092
7/10/09 7:54:52 AM /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[290] 290:2692392736|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not set tethered sync info (<CFDictionary 0x30eac0 [0xa03361a0]>{type = mutable, count = 2, capacity = 3, pairs = (
1 : <CFString 0x30eaa0 [0xa03361a0]>{contents = "DisableTethered"} = <CFNumber 0x10f000 [0xa03361a0]>{value = +1, type = kCFNumberSInt32Type}
2 : <CFString 0x126720 [0xa03361a0]>{contents = "SyncingOS"} = <CFString 0x133d8 [0xa03361a0]>{contents = "iPhone"}
)}) in lockdown for com.apple.Bookmarks (Bookmarks): -402653092
7/10/09 7:54:54 AM /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[290] 290:2692392736|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not find a device with the target identifier 3411946e713a2b2e0ac342d8faa77da5d4c7da0a. Assuming there are no disabled data classes.
7/10/09 7:54:54 AM /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[290] 290:2692392736|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not find a device with the target identifier 3411946e713a2b2e0ac342d8faa77da5d4c7da0a. Assuming there are no disabled data classes.
7/10/09 7:54:56 AM /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper[290] 290:2692392736|AppleMobileDeviceHelper.m:_setTetheredSyncLockdownInfoForTarget| ERROR: Could not find a device with the target identifier 3411946e713a2b2e0ac342d8faa77da5d4c7da0a. Assuming there are no disabled data classes.
7/10/09 7:54:52 AM [0x0-0x20020].com.apple.iTunes[284] MobileDevice: lockssl_handshake: SSL handshake controlled failure 0: SSLERRORSYSCALL (Early EOF reached)
7/10/09 7:54:52 AM [0x0-0x20020].com.apple.iTunes[284] MobileDevice: send_message: Could not send message size: Broken pipe

My iphone 5 doesn't sync with itunes on my pc. it says this computer has previously been synced to another io6 device or iphone? please help what to do?

My iphone 5 doesn't sync with itunes on my pc. it says this computer has previously been synced to another io6 device or iphone? please help what to do?

The error message you're seeing is likely the other way around -- i.e. something like "This iPhone has previously been synced with a different computer". There's no problem syncing multiple iOS devices to the same computer.
However, the reverse is not true for the iPhone -- you cannot connect an iPhone to another computer without it being erased, even if you manually manage music and video. So, it sounds like you've been syncing your iPhone to a different computer?
Also, 5.1 (not 5.0.1) is the latest iOS.

IPhone 4 doesn't sync with iTunes 11.3.1

iPhone 4 will not sync with iTunes 11.3.1 on MacBook. Used to pop up in iTunes to sync when plugged in, but now doesn't recognize that the phone is there. iPhone is also up to date.

Hi there Amart229,
You may find the troubleshooting steps in the article below helpful.
iOS: Device not recognized in iTunes for OS X
http://support.apple.com/kb/TS1591
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/TS1538
-Griff W.

My iphone will no longer sync with itunes

My iphone 4s has stopped syncing with iTunes. It was syncing initially after the ios7 upgrade but has since stopped working. I have uninstalled and re-installed iTunes but yo no avail. Any ideas?

Hi Siboard100,
Welcome to the Support Communities!
Here are a few more troubleshooting steps that you can try:
Sign out of your iTunes Store account:
iOS: Changing the signed-in iTunes Store Apple ID account
http://support.apple.com/kb/HT1311?viewlocale=en_US
Restart and/or reset your iPhone:
iOS: Turning off and on (restarting) and resetting
http://support.apple.com/kb/HT1430
Try syncing again with iTunes - here are the links for Mac and PC:
iTunes 11 for Mac: Set up syncing for iPod, iPhone, or iPad
http://support.apple.com/kb/PH12113
iTunes 11 for Windows: Set up syncing for iPod, iPhone, or iPad
http://support.apple.com/kb/PH12313
Cheers,
Judy

Why won't my iphone 3gs will not sync with itunes???

My Iphone 3GS will not sync with itunes on my iMac computer. Currently the device is plugged in and recieving a charge. I am operating the version 10.6 in itunes and the version OS5.1 on the 3GS. Can anyone help me figure this out?!?!?!

try this article
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.

IPhone 4 restarting problems when syncing with iTunes

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