How long is a piece of string?
If you are working in ArchiCAD 10, you can ask it to give you polygon count, but there's no absolute limit that I know of.
Can you make it render with the internal engine?
Can you make it show up in the 3D window?
I suspect that you have a marquee or element outside the view erroneously selected when you mean to have the entire model rendered. Ask it for a parallel view and see if the elemet shows up.
This blank screen thing DOES happen to me on occasion. I just keep trying and it finally works.
Dwight Atkinson