I have a Compaq nx6110 Notebook. We have about 5 of them. The one in questions is causing the AC power adapter to make some kind of ticking sound inside the AC adapter whenever connected. It sounds like a clock ticking. I tried unplugging the battery, and only having the AC power adapter plugged into the laptop as its only power source, and the sounds continue. The laptop does not receive any power. Meaning the battery does not charge, and I cannot start the laptop. I tried multiple power adapters from other nx6110 notebooks, and they all make that same sound when this laptop is connected. I also tried other batteries from other working notebooks, and still same thing.
What is this sound? Why isn't the laptop powering up?