Rendering issues

I am having issues getting anything to render. I have just installed 2.49. I’ve been working on a model and went to render and it just comes up with a black screen. Double checked camera and light…everything was fine. So I attempted to render the default scene and still nothing. I installed Yafray and tried to render with that…same thing just a black screen.

The weird thing is that if I render, close the black screen, and then click show render buffer (F11) I see the render just fine. Anyone have any idea what the heck is going on?