iPod Nano 1st Gen not connecting to my computer

My friend's iPod Nano 1st Gen won't connect to my computer (i have previsily added songs to it since last month) and now my iTunes won't show that ipod on my devices lists (I did NOT update iTunes because of the problems other people were getting)..... it will charge on my computer but WON'T sync....... WHATS UP WITH THAT???

THANKS IN ADVANCE TO THOSE THAT HELP.