blender wont render?

hey,

ive been trying to render out something but all i get is a black picture and the timer stops at 00:00:00. and before that it was only rendering in OpenGL. any thoughts?

i have lights and a camera…so it should be all sweet!

p.z. i should also add that ive tried rendering with different files and it seems to work fine. just not on this particular blend.

just not on this particular blend.
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