If you mean your computer can't recognize your iPod or iPad, you may try these methods.
1. Try another USB cord or USB cable.
2. Restrart your computer for a try.
3. Reset or restore your
iPod for a try, this way can fix many general iPod problems.
4. Update your iTunes to the latest version. Plug in your iPod,
then in iTunes in the top left corner click help> run diagnostics. On the box
that comes up, check the last two things. Click next and it should identify your
iPod.
5. You may try this iPod transfer, it's a nice iTunes alternative that
can help you upload music and video to iPod, I always use it to sync my iPod
when my iTunes can't recognize my iPod, it's easy to use and works pretty
well
http://www.ipod-transfer-copy.com/ipod-iphone-to-computer-transfer-cucusoft.html6.
Take your iPod to Apple store, the technical support may help you fix the
problem.
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