One problem that happens quite frequently with most Apple iPod products is freezing. Nobody likes a frozen screen, because you can't do anything! Well, if you have an iPod Nano (5th Generation), then this video will show you how to reset and restart it by pressing and holding the Menu and Center buttons. If you this doesn't work, you can try restoring the software via iTunes. If that doesn't fix the frozen iPod, then you'll need to contact Apple or a repair technician.