i-Devices are intended to be synched to a computer, not to send things to a computer. Ideally you would have had your computer backed up and would have restored the drive from your backup. Failing that you now have to resue things in bits and pieces using various methods.
Downloading past purchases from the App Store, iBookstore, and iTunes Store - http://support.apple.com/kb/ht2519 - enabled with iTunes 10.3 and newer; not available in all countries; apps, books (not audiobooks), music, t.v. shows, and movies (some - not all studios have permitted this). Movies currently available in the USA only. Downloading previously purchased movies and TV shows requires iTunes 10.6 or later. Discontinued items not available. For items not included in the iCloud list, or locations or computer systems where iCloud is not (yet?) available, you only get one download per fee paid. Apple notes it is your responsibility to back up your purchases.
http://support.apple.com/kb/HT1848 - just media purchased from iTunes Store
Post by Zevoneer: iPod media recovery options - https://discussions.apple.com/message/11624224 - this is an older post and many of the links are also for old posts, so bear this in mind when reading them. e.g. MusicRescue - http://www.kennettnet.co.uk/products/musicrescue/ - Mac & Windows
Am not able to use the iTunes program with any of my devices period! Actually have not purchased any music from the Apple Store, but that's beside the point. I just want to do appropriate "syncs" with all devices and am unable to do so because Apple says I can only use one iTunes program (the one that was on the old crashed hard drive and was uninstalled). What a mess!
Apple devices are intended to be synced to a single library in an attempt to limit casual piracy. iTunes spots when you connect a device to a new library and offers, somewhat unhelpfully, to wipe the device and put whatever content is in the current library onto it even though it now remains the last repository of your data. Had you backed up your library you would not be in this position...
However, you should be able to:
- Backup the device to the new installation
- Transfer your purchases into a newly authorized library
- Recover any other media using third party tools as suggested in this post from forum regular Zevoneer
- Restore the device from the backup
This process should switch the association of the device to the new library, preserving the data and settings in your apps.
May also be prudent to attempt a backup to iCloud directly from the device before you start... Settings > iCloud > Storage & Backup > iCloud Backup > On. It won't save any media but it would preserve the general account settings and documents in case anything goes wrong while you are trying to extract your other data.
When you get it all fixed, make a backup!