HUD not displaying

I have no sense of health, power, or ammunition on the screen at all. Does anyone know what the problem might be? I’m running Windows 7. Edit: The bottom of the screen was cut off due to the size of the screen resolution.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.