Laptop won't turn on.How do i fix it?

Hello,

I have a COMPAQ Presario Cq40 laptop whose two years old. While my sister was playing with it, baby brother threw an empty food can and sadly hit my laptop. It suddenly went off and wouldn't start anymore. I tried removing the battery and turned it on while its plugged in. It still wont start but the power button would glow every time. The caps lock and scroll lock would blink thrice and would go out. This happens every time i plug it in and try to turn it on.

I don't know if this helps, but at that time, my computer was on from 4 AM until around 6 PM that day. Please help!