Ipod clicking, won't turn on, computer won't recognize

Hi there,

My iPod Classic 160GB (bought earlier this year, so relatively new, most recent OS) still had battery tonight. I paused my music, put it to sleep, locked my iPod. I then later tried to turn it back on - nothing had happened to the iPod physically, no knocks, no spills etc, since I turned the iPod off. It wouldn't turn on, I thought the battery had died. However upon pluggng it in, and leaving it for half an hour, it showed no signs of life, and was making clicking noises coming from the harddrive. A hard reset had no effect. Plugging it via USB cord had no effect either, and the computer didn't pick it up - so I cannot restore my iPod to factory settings. The screen is completely black and won't respond to anything.

Help! D: