only ONE object rendering

When I press F12 to render my Scene, Blender (2.57) only renders ONE object.
I activated ALL layers and did not use compositing.
please help :spin:

There are so many possibilities and so little info. Post your blend file here so other users can easily sort your problem out

sorry, here is the link;

Make one of the windows an Outliner window. You will see the camera icon greyed out for lots of objects. This makes them not rendered. Just click the camera icon to turn them back on again. At some point you must have turned their renderability off.

thank yo sooo much !!! it works