My MacBook isn't charging and now won't turn on?

My dad ordered me a MacBook on eBay it's like 3 years old. Well the first 2 days it worked fine but last night I let it go down til almost dead and plugged it in and it said not charging so I wiggled the power cord and the light finally turned orange so I thought it was charging. This morning I got up to a dead computer. I did the whole reset power off thing but after I powered off now it won't turn on. I tried taking out the battery Unpluging the power cord then plugging it back in and putting the battery in but it still doesn't work. What should I do? I can't even get the stupid thing to turn on!!