Regardless, Chuck's suggestion is correct I think.
Hold down the middle button and play/pause for several seconds. Hopefully you'll see the Apple logo?
(Without the hold lock being on.)
If you hold them both for 15 seconds and nothing happens, then connect it to your PC, and leave it a few minutes. Run iTunes, and give it a few minutes to show up. If so, click the restore button. You shouldn't lose your music, assuming you have it on your PC too.
If still nothing happens, leave it connected to the power for 30mins or so, then see if the middle button and play/pause hold trick will work.