Library disappeared and 'unauthorized' computer to sync ipod

when i open itunes, all of my library has disappeared and then when i plug in my ipod it says that it is connected to another computer (even though it isn't) and so i'm not allowed to sync it without erasing my ipod. please help? thanks

Empty/corrupt library after upgrade/crash
Hopefully it's not been too long since you last upgraded iTunes, in fact if you get an empty/incomplete library immediately after upgrading then with the following steps you shouldn't lose a thing or need to do any further housekeeping. In the Previous iTunes Libraries folder should be a number of dated iTunes Library files. Take the most recent of these and copy it into the iTunes folder. Rename iTunes Library.itl as iTunes Library (Corrupt).itl and then rename the restored file as iTunes Library.itl. Start iTunes. Should all be good, bar any recent additions to or deletions from your library.
See iTunes Folder Watch for a tool to catch up with any changes since the backup file was created.
When you get it all working make a backup!
tt2

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When I downloaded the newest version of iTunes, my previously downloaded music in iTunes library disappeared on my computer? There was no warning of this happening. What do I do?

Ok, so I downloaded the newest version of iTunes on my home PC, and the previously downloaded music in my iTunes library disappeared on my computer. What happened? I can sync my iPod but I am not sure how long ago I synced it so I may be missing some music downloads. Why did this happen, and more importantly, why didn't iTunes warn me it could happen and advise me to sync with another device before the download? I am not very happy about this and it's a huge issue for iTunes if this is happening. It makes me very wary of iTunes.

Empty/corrupt library after upgrade/crash
Hopefully it's not been too long since you last upgraded iTunes, in fact if you get an empty/incomplete library immediately after upgrading then with the following steps then you shouldn't lose a thing or need to do any further housekeeping. In the Previous iTunes Libraries folder should be a number of dated iTunes Library files. Take the most recent of these and copy it into the iTunes folder. Rename iTunes Library.itl as iTunes Library (Corrupt).itl and then rename the restored file as iTunes Library.itl. Start iTunes. Should all be good, bar any recent additions to or deletions from your library.
See iTunes Folder Watch for a tool to catch up with any changes since the backup file was created.
When you get it all working make a backup!
tt2

TS1591 how to authorize new computer and apple id to sync ipod when you don't remember password for old apple id and email address?

some of my songs and music videos won't sync from my new computer to the ipod. message reads that i need to authorize this computer to sync to the ipod and i cannot remember my old password from the old apple id or email that pops up in the authorization box, i was able to do it for all my other songs, especially the most recent purchases but cannot for 19 (4 being music videos) what should i do?

Recover them
Is there a way to find my Apple ID Name if I can't remember it?
Yes. Visit My Apple ID and click Find your Apple ID. See Finding your Apple ID if you'd like more information.
How do I change or recover a forgotten Apple ID Password?
If you've forgotten your Apple ID Password or want to change it, go to My Apple ID and follow the instructions. SeeChanging your Apple ID password if you'd like more information.

Nano2G disappears from My Computer after sync

Alright, so when I connect my nano (version 1.1.3) to my computer, it does all the normal stuff; open up iTunes, show up in My Computer, start auto-syncing. But after it's done syncing, it disappears from My Computer and an error comes up (see below). The iPod, however, still appears in iTunes, the Device Manager, AND the Safely Remove Hardware window(even though I can't do anything with the iPod cuz the computer won't recognize it's there).
The error:
F:\ referes to a location that is unavailable. It could be on a hard drive on this computer, or on a network. Check to make sure that the disk is properly inserted, or that you are connected to the Internet or your network, and then try again. If it still cannot be located, the information might have been moved to a different location.

okay. so it doesn't look like the problem arises from the underlying Windows-to-drive connection, but rather something to do with the way that the "ipod-ish" software/settings/etc are behaving on the PC.
my thought here is that we should try a restore of the ipod. that's because preferences like "enable disk use" or "manually manage music" are stored (at least partially) on the ipod itself. a restore should clean those off the ipod and replace them with fresh default settings.
it would be best to reenable iTunesHelper and the iPod Service (in MSCONFIG) prior to doing the restore (otherwise, we may not be able to get itunes to recognise it as an ipod to do the restore.)
do you still get the same odd behavior with the ipod on syncing after the restore?

How can I get my iPhone 4s and my computer to sync an msn email account?

I had a Blackberry before my IPhone. On the BB, when I read an email received using my Windows Live account (@msn.com), which I also use as my default email on my Mac, I was asked if I wanted to delete the message from my phone only, my computer only, or from both. The msn is a pop account. Now that I have my IPhone, I can not get my phone email and my computer email to sync the same way. I understand, from an hour on the phone with Apple support, that an imap account will work that way--ex., my yahoo acount. When I delete a message from my IPhone it also deletes from my yahoo account. However, I don't often check that account because we use the msn account for the majority of emails and the msn is set up in the computer's mail account. I was told that because it is a pop account there is possibly no way to make them sync that way. I wonder if anyone else has run across this issue and if there is any solution at all? Is it possible to set up an msn.com account using imap on my computer?

Perhaps you should try using "shared photo stream", if the other phone can view the stream?
http://support.apple.com/kb/TI104
HTH

ITunes library disappeared and cannot reinstall from Time Machine

I have searched all support threads for my problem -- updated to Mavericks and all my playlists disappeared and audio files that the new itunes didn't seem to know what to do with (meditation i.e.) I've tried to reinstall from Time Machine, but all support threads refer to itunes library and folder which I don't have anymore. I drag it to the desktop and tried to reload from there. I tried to do it directly from TM but get the error message that says something about a file instead of a folder.
Has anyone else had this

This is what things should look like:
More on iTunes library files and what they do - http://en.wikipedia.org/wiki/ITunes#Media_management
What are all those iTunes files? - http://www.macworld.com/article/139974/2009/04/itunes_files.html
Where are my iTunes files located? - http://support.apple.com/kb/ht1391
iTunes 9 [and later]: Understanding iTunes Media Organization - http://support.apple.com/kb/ht3847
Image of folder structure and explanation of different iTunes versions (turingtest2 post) - https://discussions.apple.com/message/13025536 and https://discussions.apple.com/message/17457605

How did my entire music library disappear and how do I retrieve it?

Have not used iTunes in several months. Only had music, but it was a large library. A few tunes were from a personal CD and most were purchased. I recently opened the library to find it empty. Where did my songs go. They been there for years! Why would they suddenly disappear and how do I get them back???

Empty/corrupt library after upgrade/crash
Hopefully it's not been too long since you last upgraded iTunes, in fact if you get an empty/incomplete library immediately after upgrading then with the following steps you shouldn't lose a thing or need to do any further housekeeping. In the Previous iTunes Libraries folder should be a number of dated iTunes Library files. Take the most recent of these and copy it into the iTunes folder. Rename iTunes Library.itl as iTunes Library (Corrupt).itl and then rename the restored file as iTunes Library.itl. Start iTunes. Should all be good, bar any recent additions to or deletions from your library.
See iTunes Folder Watch for a tool to catch up with any changes since the backup file was created.
When you get it all working make a backup!
tt2

IMovie: Event Library Disappears and Projects are Not Editable...

Was in the middle of editing an iMovie project when it froze.
Restarted the application and now there is no list under Project Library, and I can't click on the Event Library.
I can see that the video is still there because it plays when I hit the spacebar but I can't edit any video components or export it.
Have tried restarting, installing updates, etc but no luck.

Delete (trash) iMovie's preference file. First, close iMovie then in Finder go to your user (home) folder Library>Preferences and locate the file named "com.apple.iMovie8.plist". Drag this file to the Trash. When next opened, iMovie will create a new preference file with the default settings.
You may need to change some settings to suit your own preference. To do this, in iMovie go to the menu item iMove>Preferences and if desired change any settings under each of the 4 tabs.
John

HT1379 i tried to update and there was an error, i tried again. when i tried to start, i get the chime and a progress bar that goes about 25% then disappears and the computer turns off. nothing works. it does this every time i try to start

i just received a mac book pro from my dad. while trying to get used to it i tried to upgrade the os which failed because of an error. i tried again. when i tried to start later, i get a chime, and progress bar, and a spinning wheel. after 1 minute the bar is only progressed 25% then it disappears and the screen goes black. none of the keys work. I tried to re boot and the same thing happens. what do i do?

If it's new and you don't have anything on it yet, you can reinstall the OS from scratch. You don't say what OS or model, but try booting while holding down the Command and R keys. If you get the recovery partition, use Disk Utility to reformat the disk then reinstall.
This will wipe out everything on the drive though.

I have a new computer and have created another library. When i try to sync ipod it says i have two libraries and can only sync with one. How do i retrieve other library. My old computer is dead

I have a new computer and created an additional library. I need to merge the 2 so i can sync my ipod with new computer

How to use your iPod to move your music to a new computer

My originsl itunes library disappeared and I only have recently purchased music, but all music is in my iphone 5 can I put this music into library and or ipod from my iphone

I lost my original itunes library today when I got new computer, I'm sure I did it in error, but the question is all my music is still on iphone 5 can I load this music back to my library or my ipod from the iphone? Right now my libray only shows 7 songs I purchased today. Thanks for any assistance.

Hello gadawgirl21,
Thanks for using Apple Support Communities.
For more information, take a look at:
iTunes: How to move your music to a new computer
http://support.apple.com/kb/ht4527
Transferring purchases
If your iPhone, iPad, or iPod has your purchased content from the iTunes Store, you can transfer the content to a computer that is authorized for your Apple ID.
Note: This option only works for content you purchased from the iTunes Store (as opposed to content from other sources, such as CDs you may have imported). For content you did not purchase from the iTunes Store,synchronization occurs in one direction only. This means your content can be copied from a computer to your iOS device, but cannot be copied from your device to a computer.
Open iTunes.
From the Store menu, choose Authorize This Computer.
Enter your Apple ID and password. Then, click the Authorize button.
Connect your device your computer. If it is synced with another iTunes library, you may be asked if you want to "Erase and Sync" or "Transfer Purchases."
If that alert appears, click Transfer Purchases.
Important: Clicking Erase and Sync will delete any existing content currently on your device. The content would then be replaced with the content that is on the computer.
If you were not offered the option to transfer purchases:
After connecting your device to the computer, its icon appears in iTunes. Click the icon.
From the File > Devices menu, choose "Transfer Purchases from 'Your device name.'"
Have a nice day,
Mario

My iMac harddrive crashed and was replaced and I would like to put my iTunes library back in to computer off my iPod. Is it possible and how do I do it?

I just got my Mac back with a new hard drive. I lost part of my iTunes library but it was saved before the loss of the hard drive on my iPod Classic. Is it possible to use the iPod as an external hard drive and regain my library on my computer? If so, how do I do it?

See this excellent user tip from another forum member turingtest2 outlining the different methods and software available to help you copy content from your iPod back to your PC and into iTunes.
Recovering your iTunes library from your iPod or iOS device
B-rock

Updated to iOS6, a week later, photos disappeared and photostream/iPhoto stopped syncing.

I updated my 4s to iOS 6, and my photos were fine. A week later, and my photos have disappeared, though the album names are there. (I don't have access to a PC, so I can't use the iExplorer trick to find the photo files.)
All of my photos exist on my photostream on my iPad, but the photostream is not syncing on my iPhone. (Yes, the photostream is turned on on both devices.)
In addition, many of the photos were backed up with iPhoto, and iTunes says 44 of them shoudl be synced with my phone--but they are not syncing either.
My OS is not up to date on my Mac (I know, I know, but I deleted the app store and am too lazy to update) so I can't access my photostream on my computer.
I created a "shared" photostream with every photo from my photostream, and only 40 of 1000 photos (the one taken by my iPad rather than my iPhone) have appeared on my iphone in this shared photostream.
Questions:
1. How do I access the photo files on my iphone, given I don't have a PC? Or is a shared photostream the best option?
2. How do I get my photostream to sync with my iPhone, despite the fact that my phone and iPad settings say it should already be syncing?
3. How do I get iPhoto to sync with my iPhone, despite the fact that my computer setttings say it should already be syncing?

Try deleting what is called the iPod Photo Cache.
http://support.apple.com/kb/TS1314

Using another computer to sync iPod nano

My grandson has an iPod and subscribes to iTunes. My question is: If I connect to his computer will it automatically download all from his iPod library on to my iPod Nano. Or can I set up my own Itunes as a separate account on his computer. Hope this makes sense.
Be grateful for a quick response. By the way I am living in the UK and he is in Australia where I shall be on holiday soon.
Thanks

If you want to connect and use an iPod on more than one computer or with more than one library you need to change the update preference in the iPod Summary tab to "Manually manage music and videos" and click Apply. The content of iTunes and the iPod are not syncronised in this mode so the two can be different:
Using iPod with Multiple computers
Managing content manually on iPod
Syncing Music to iPod
Something else to be aware of when using an iPod in manual mode is that the "Do Not Disconnect" message will remain on the display until you physically eject the device: Safely Disconnect IPod

Using another computer to sync ipod?

My main laptop just died and not sure it can be resurrected and it was the computer to which my ipod was synced---it was a PC with Windows XP. I have another and newer PC laptop with Windows 7 but it doesn't have all my data on the hard drive, For example, there's no contact info on this newer laptop. I've already 'authorized' this laptop with iTunes but what I need to know before plugging my ipod into this new laptop is what happens when the units sync---will I lose all the contact info that is now resident on my ipod? Or, wiil the contact info now on the ipod transfer to the newer laptop? Thanks for any help you can provide.

If you want to connect and use an iPod on more than one computer or with more than one library you need to change the update preference in the iPod Summary tab to "Manually manage music and videos" and click Apply. The content of iTunes and the iPod are not syncronised in this mode so the two can be different:
Using iPod with Multiple computers
Managing content manually on iPod
Syncing Music to iPod
Something else to be aware of when using an iPod in manual mode is that the "Do Not Disconnect" message will remain on the display until you physically eject the device: Safely Disconnect IPod

Library disappeared and 'unauthorized' computer to sync ipod

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