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?