Does Maya actually 'freeze' or you cant see the model? Dont forget CAD programs usually work in metres to start with and world co ords might NOT be 0,0,0. IF Maya isnt freezing...then go to the outliner and see if its in there..if so..click on it then frame it. (F) key. It may also have something to do with what n88tr is saying or it has so many verts Maya does not like it.

Cheers bullet