new iPod nano went black and can't recover

Hi.

My iPod nano has stopped working. It had The screen has gone black and it won't charge. Beside before it went black, there were some power left in the battery. I can't turn it on and it is not recognized by iTunes. I've already tried to reset but it didn't work. It looks like the battery is dead.

I purchased about 6 months ago in America but I am in Korea now. Can I get an warranty service over here? Please help or advice.