Everytime I try and turn off my Inspiron N5110 Dell Laptop, it will say shutting down and the screen will go black but the power button light will never go off. Also, if I leave it sitting and it falls asleep it won't actually hibernate and I will have to hold the power button to turn it off all the way and then turn it back on. It recently stopped charging and would only work when it was plugged in but it has started charging again. Any ideas on what's wrong or how to fix it??