Window not displaying anything

I am making a C++ project for school and decided I want to do something with opengl.
I followed the tutorial at this site but when I got to the section about creating a simple wireframe cube, I can’t make it work. It compiles just fine, but when the window opens it shows nothing but black. These computers here at school have ATI r128 and pentium 2’s and I am using visual which is plenty adequate, so can anyone offer some help on how to make this work?

this may be silly, but did you try translating your cube away from you?