Thanks for your help guys. I think I'm just out of luck. I've tried everything under apple's list and still no luck. Can't afford new parts right now and I know the Apple guys will need to open it up to see what's wrong; and of course it's no longer under warranty. Looks like I've got a fancy new paperweight.
If you live near an Apple Store, you can still make an appointment and take it into to have them take a look at it for no charge. It is only if they reach the point of needing to repair something where they will charge you, but you can always walk away at that point.
And if you are adventurous and they tell you what is wrong (like say they tell you the battery is bad), then you might be able to buy parts and fix it yourself. Somethings are actually not that hard to do and you can get parts yourself. For example, here is parts you can get for 13" Unibody MacBook 2 GHz (not sure if that is your specific model...there are a couple 13" Unibody MacBook models):http://www.ifixit.com/Mac-Parts/MacBook-13%22-Unibody-2-GHz
I bought replacement fans for my original 2006 MacBook Pro from them and used their instructions to install them. For example, replacing the battery on 13" Unibody MacBook is very easy for some models and only a little more complex for other models.