Why does my model not appear as a solid?

[tfulmer]

In my classes the students can create a simple model and when you extrude it the model appears as a wireframe look even though the settings are set as a shaded view. On my laptop that I teach from the images show as the standard gray material (As Material). If we are all using the same software (Inventor 2010) then why do we get different images?

[tfulmer]

Thanks for all the responses. I found another question posted elsewhere that was the same issue. It seems that our cheap school computers do not have a good enough video card and so we have to run on the lowest settings to keep from bombing out.