TREO 650 won't take a charge.?

I'm sorry, but it can't be fixed. Contact your provider's tech support and get your Treo replaced (most PDA replacements aren't done in store but over the phone). The information you gave here, especially that you've tried 3 different charges, will enable you to get a replacement. I don't know who your provider is, but with Verizon, if you've had the phone less than a year, you can get it replaced for free...up to two years if you have insurance. Otherwise it is a $50 fee for replacement. Good luck!

EDIT: Since you say you're not insured and didn't get this from your service provider, try calling Palm themselves and seeing what they can do. They may not be able to replace it for you, but it's definitely worth a try. They may be able to have you send it in for possible repairs, but I can't promise they will...it's just a possibility. Usually both manufacturers and service providers are really reluctant to mess with anything that came from eBay. You may end up having to purchase another phone if Palm won't do antyhing for you. I'm sorry.