iPod Nano 5th Gen is stuck on the Apple Logo, won't go into disk mode and won't connect to computer.

My iPod Nano 5th Generation won't turn on; I've held down "Menu" and the center button which makes the Apple logo come up, then it just stays on that. I've followed steps I've seen on here trying to get it into disk mode by holding down the "Play/Pause" button and the center button immediately after the Apple Logo appears but it doesn't respond to that at all. I've charged it and upgraded my iTunes but nothing seems to do anything to it. When I plug it into my computer there is nothing to say it's plugged in on iTunes or My computer or anything. It's driving me crazy and I'm hoping there's a way I can fix it without it having to be sent off.
Any advice would be cracking!
Thanks,
Tilda