What you will need to do.
I found a dell laptop that this happened to a few years back. The computer would not boot so, I pulled it appart (not recomended unless you are a very carefull, inquizitive type).I found that the power ciruit board was fried by the milk shorting a few chips on the board. I found a website called impact computers which sold the exact part I was looking for (cost me around $80 au) which I instaled myself. Two years on, and it's still working.
Sorry I couldn't put the full website name up there as it could be construde as spamming.