I have a laptop problem?

Well i have a dv6700 hp pavillion laptop. The problem with it is whenever the charger is plugged in.. i press the power button and sometimes i get a black screen or i hear a beeping noise on the left side then it shuts down… Now when ever the charger is unplugged and i press the power button nothing happens at all. Another thing is whenever its plugged in and i randomly take the charger off everything turns off.. Any solutions?