Help me fix my mp4?

I bought the Alba MPK4065B and it is flat and black, and extremely fragile. But I stepped on it by accident and now when I turn it on half the screen is white and covered in blue-ish black splodges and I can only see a little bit on the bottom, it also has little crack marks, but the outer screen is fine - there's not even a scratch. How could I fix my problem please?

Fayza
October 2010