Dell Inspiron

I have a Dell Inspiron 1545.  One day, one of my friends dropped it.  The screen was fine and it continued to work normally after that.  The only issue was that when I plugged it in, it wouldn't charge at all and I have since been unable to use my laptop.  I suspect a wire has come loose somewhere in the area, but I can't get the back off.  Is there a holding clip on it at all?  If so, how do I get the back off?