How do I get my iPhone 3G to display in my iTunes device list on my mac computer?

The best way to transfer music from iPod to computer is using a third-party tool like iAny Manager.

Here are what iAny Manager can do
1. Importing Music,videos to iOS devices from PC
2. Transfer files to PC from iphone/ipad/ipod
3. Getting music,playlist, apps of your iOS device back into iTunes
4. Direct Apple to Apple transfer
5. Good transfer speed without slowing down your PC

Step by step guide:
iAny Manager Transfer iOS Devices Data Backup Sync Restore Manage Data...

Unintall the current Itune and the download again new version then try if still the problem remains then change the cable to avoide this problem. after trying this, if the problem still exists, you should try this thing on another person's computer with new itune new cable and then see, evern then try restarting iphon or clean that part of your iphon where the data cable connected with computer. good luck

It's not broken. You need to do as I tell. Make sure to count every second.
First, hold the power button (the only button on the top-right corner of your iPhone.
Then, after just a second (literally, 1 second), press and hold the Home button (the only button on the face of your iPhone) at the same time for about 10 seconds. Just to clarify, you must be holding both the power and the Home button during this 10 seconds.
After that, release ONLY the power button and keep holding the Home button for about 10 to 30 seconds longer, until you see this image:


This means your iPhone is already in DFU mode and iTunes from your computer can recognize it already. This also means that you can restore your iPhone and make it operational again.
Now, when you restore, I suggest that you restore to 3.1.2 and not to the latest 3.1.3 software version, so it can be possible for you to jailbreak your iPhone.
And to restore to 3.1.2, here's what you gotta do:
Click here where you will see 2 selections: (1) iPod; and (2) iPhone / iPod touch.
Focus on iPhone / iPod touch and select iPhone 3G (3.1.2/7D11) or iPhone 3G S (3.1.2/7D11) - depending on whether your device is a 3G or a 3G S - and then click download. Tip: it's better if you save it on your desktop.
After the download is finished, open iTunes from your computer, and select your device. You should see the restore button there but before you click it, you must first, hold Alt (or Option) if your using a Mac, or CTRL if your using Windows. This will let you choose what software version you want to restore your iPhone with. So, you must select the one that you just downloaded and click restore.
That should do the trick.

Yes, that means you must connect your iPhone to a computer and manage it over iTunes (also in your computer).
If you must restore, try this:

Go to this website: http://www.felixbruns.de/iPod/firmware/

you will see there 2 selections: (1) iPod; and (2) iPhone / iPod touch.

Focus on iPhone / iPod touch and select iPhone 3G (3.1.2/7D11) or iPhone 3G S (3.1.2/7D11) - depending on whether your device is a 3G or a 3G S - and then click download. Tip: it's better if you save it on your desktop.

After the download is finished, open iTunes from your computer, and select your device. You should see the restore button there but before you click it, you must first, hold Alt (or Option) if your using a Mac, or CTRL if your using Windows, once your already holding the appropriate buttons, click restore. This will let you choose what software version you want to restore in your iPhone. So, you must select the one that you just downloaded and click restore.

Now, let me just tell you that "baking up" actually means, creating a back up. It doesn't mean that your iPhone is refusing or moving back. So when you think your iPhone is stuck, just wait a little longer, I mean, do other stuff first and return to your iPhone after 5 or more minutes. Alright...

That should do the trick. Goodluck..

Using iTunes, connect the iPhone to the original computer it synced with. Once it is connected to iTunes, it should unlock. You should now be able to change the code.

If you do not have access to the original computer it synced with, you can connect it to iTunes on a different computer and click "Restore". This will unlock the iPhone. This will also delete all data, though.

When you sync your iPhone to a computer via iTunes, the software creates a backup of your iPhone's data viewable following Edit - Preferences - Devices, in iTunes.

Here is simple guide for those Users who will be first time upgrading their iPhone 2.2 or 2.2.1 to firmware 3.0. The guide is applicable for Upgrading iPhone 2G/3G 2.2 or 2.2.1 to OS 3.0 and also for iPod Touch. Please note in order to upgrade iPhone to firmware 3.0 you must have installed iTunes 8.2.
How to Upgrade iPhone 3G 2.2/2.1 to 3.0 firmware 1. Connect your iPhone 3G to computer
2. Open iTunes 8.2
3. Select your iPhone under Devices in the Source List on the left.
4. In the iPhone Summary pane, click Check for Update.
5. Click Download and Install. Do not disconnect your iPhone until the update has finished
That’s it, Once update is finished your will have iPhone 3G running latest firmware 3.0.

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RNJ VINODKUMAR

As for this situation, I think you'd better try the 3rd-party program rather than iTunes. Just follow below steps to reach this goal. Download Leawo iTransfer ' Leawo iTransfer for Mac and install it.
Step 1. Run Leawo iTransfer for Mac and Connect iPhone
Launch Leawo iTransfer for Mac after installing it on your new Mac computer. When the software indicates that you can connect your iOS device, plug your iPhone to Mac via the USB cable. The software will automatically detect your iPhone and show the Libraries on the left sidebar. The files will show on the right part of the window after you choose a library.

Step 2. Select Files to Sync
Choose a Library and then all the files in the library will show on the right part of the software (Set the Music Library as an example). Click the transfer button (the right arrow in a dark-blue rectangle) at the right bottom to transfer all the files to computer. Or you can hold Ctrl key and click to choose certain files, and then right click the chosen files and choose "Transfer to > My Computer".

Step 3. Transfer Settings
After choosing files, a dialog of transfer settings comes out. In this dialog, you are able to check "Transfer to List" and "Save to Folder". Checking "Transfer to List" can make sure your files be transferred to iTunes; Check "Save to Folder" and click "Change" to choose a target folder to save the transferred files. If you are using a new computer and the iTunes is newly installed, I suggest you check both options. After choosing target folder, click "Transfer Now" to start to sync iPhone to new computer.

Step 4. Syncing iPhone to New Mac
When the transfer begins, you will see a dialog of transfer process. A progress bar in the dialog will show you the percentage of the syncing process. When the syncing process is finished, you will find all the files in your target folder and iTunes.



For more detail, check: How to Sync iPhone to New Mac without Losing Data