My laptops plugged in but when the fan, lights and

This is odd, one issue may be the external button may not be making contact with the button underneath if you're feeling brave you can try and pop the panel between the keyboard and the screen off and try and press the button manually and see if that helps, if not there may be a problem with the actual AC jack itself. Are you getting a charge light when the laptop is plugged in? It's also possible that your AC adapter may have gone bad. the only way to test this that i can think of offhand is to use a multi-meter and see if you are getting the correct voltage from the plug. good luck and let me know what you figure out