AC adapter turns off when plugged into laptop

Dell Studio 17 laptop. Whenever I plug the adapter into the laptop, it turns the adapter off and doesn't charge the laptop.

Laptop still turns on and is fine with the battery in on its current charge. When AC adapter is plugged in, the adapter LED turns off. The charging LED on the laptop does not change. When battery is removed and adapter is plugged in, the adapter LED immediately turns off. When the laptop is on and the charger is plugged in, the laptop does not charge. Any ideas why?

Also, when I plug in the adapter and turn on the laptop, the laptop does charge but makes a buzzing sound that makes me nervous.
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  1. Such problems can be due to a failing battery.

    I would consider replacing the battery. They do not last forever.
  2. I second above poster's suggestion. It is 99% battery. I had the same problem, and after I replaced the battery everything was fine.
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