Abstract: The present invention discloses a hinge assembly for notebook computers capable of keeping a screen of a monitor connected face-to-face with a main system of the notebook, and such hinge assembly also can keep an included angle between the monitor and the main system from zero degree (i.e. closed status for stacking the monitor and the main system) to 180 degrees (i.e. horizontally aligned status of the monitor and the main system). Furthermore, the monitor can continue to be turned over until the screen of the monitor faces the back of the main system, and then further till the monitor and the main system are in the back-to-back contact with each other.