Dropped DSLite, wont turn on.

My cousins decided to leave my DSLite hanging on the edge of the table and it fell pretty hard. Although I didn't really think anything of it until I tried turning it on but the power light wouldnt light up. It has no problem charging though, the orange light still works. Just wont turn turn on.
Hao do I fixed this. Do I need to open it up?

The thing is, a friend of mine flashed it for me before I got it as a gift. Doesn't that void the warranty?