Ipod 5th and ipod 4th not syncing

Question

hi downloaded new itunes, middle daughter's ipod 5th sync first time then never again, first daughter ipod 4th want sync. both ipod when go to sync come up with music, photos others sizes, serial num etc but want sync. run digan test connectivity test ok both ipods but sync test fail no ipod found.any ideas ta,

Answer 1

For your first question, see this Apple support document.
Identifying iPod models
As for your second question, we need to figure out how your music is configured to sync to your device.  So you'll want to double check to see what options you have enabled from under your iPod's Summary and Music configuration tabs in iTunes.  To access these tabs, plug your iPod in and click on it from under the Devices section in the left hand pane of iTunes to bring yourself to the Summary tab.  Make note of what options are enabled here and then locate the Music tab along the top and select it.  Also make note of what you have configured here and report back what you have found out.
For example, if you find that your iPod is set up to Sync only checked songs and videos (this option is found under the Summary tab) then make sure all of these new tracks have tick marks next to them in your main iTunes library.
B-rock