Thanks for the info on the age (I wasn't sure how long I had had it actually, it felt like 2 years though). As for taking it apart I have it completely disassembled on my computer desk, but I'm not sure what to do now. Nothing looks burnt or fried and I'm pretty sure the battery is still fine. It seems as thought the battery can't be removed though so I can't be sure, but for now I'm gonna check every other possibility.
By the way, are there any common problem areas in the circuitry that I should check out while I have it apart?