IPod touch 2G problems. Battery is fried? Hardware problem? HELP?

im still having trouble with my iPod touch. I left it in a dock on night to charge and when I tried to use it the next morning it didn't work. When I try to turn it on, the apple logo just shows up for about two minutes and then it shuts off again. I don't know what's wrong with it. Is the battery fried? How can I fix it??