A hinge assembly has a pintle, a torque assembly and a resistance assembly. The pintle has a head formed on the pintle. The torque assembly is mounted on the pintle at a first side of the head to provide a force to automatically open the cover relative to the body to a first angle. The resistance assembly is mounted on the pintle at a second side of the head to provide a frictional force to hold the cover at a second angle relative to the body when the cover is closed relative to the body. Accordingly, the cover can be pivoted open relative to the body automatically with the torque provided by the torque assembly.