Currently Being ModeratedAug 2, 2013 7:00 AM (in response to CarolineRachel226)
Take it into an Apple store or an Apple authorized repair center (you can find them on the Apple web site) for an evaluation.
This is really not something you can trouble shoot yourself as you almost certainly have internal damage from electrical shorting of one or more components. You need a professional service tech to evaluate it for you and give you an estimate on repairs. Apple will provide the evaluation and estimate free of charge, and you can then decide if you want to pay for repairs or just replace the damaged machine with a new one.
Hate to be the bearer of bad news, but be prepared that the cost of repair may be very high.
If you ultimately decide to have a go at repairing it yourself, look to places like http://www.ifixit.com for some help, parts lists and prices, and repair guides.