I have a compaq presario 900 laptop. When I plug the AC cord into the laptop, the cord makes a beeping sound and then there was a bad electronic burning smell..... and the Computer does not recieve power. It is NOT the cord. I bought a new one and same thing happened. Can I replace this part of the laptop - the reciever of the plug. At least, can anyone telling me what this part is called and so can ask others about this with correct lingo.... thanks!