I plugged in my i pod and came back a hour later

you will need to reset your ipod this will not delete songs. 1 Toggle the Hold switch on and off (slide it to HOLD and then back again).
2 Press and hold Menu and the Center button for at least 6 seconds, until the
Apple logo appears.
If iPod nano won’t turn on or respond
â Make sure the Hold switch isn’t set to HOLD.
â The iPod nano battery might need to be recharged. Connect iPod nano to your
computer or to an Apple USB Power Adapter and let the battery recharge. Look for
the lightning bolt icon on the iPod nano screen to verify that iPod nano is receiving
a charge.
To charge the battery, connect iPod nano to a USB 2.0 port on your computer.

toggle hold switch on and off make sure ipod isn't on hold then hold menu and middle button at the same time for about six seconds