Q: Nothing will connect

What iOS version on the iPod?

What computer OS and version?

What version of iTunes is installed?

If you don‘t see your connected device in iTunes for Mac

Or

First:

iTunes: Fix iPhone or iPod Not Detected in Windows 10

next try

iPhone, iPad, or iPod not recognized in iTunes for Windows

- I would start with

Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP

or                                                                                                                                  

Remove and reinstall iTunes and related software components for Windows 7 and later

- New cable and different USB port

Also see:

iPod not recognised by windows iTunes - ASC

Troubleshooting issues with iTunes for Windows updates

- Try on another computer to help determine if computer or iPod problem