Absolutely no light showing...totally at a loss Really can't understand why I can't see anything.  Tried moving lamp and camera, increasing strength, but nothing.  Can't even see light in the lamp preview.  I'm pretty new to Blender, so I feel like I must've done something accidently along the way.

http://www.pasteall.org/blend/38975
It seems fine for me, I get quite a neat render. 
But if you want it to light up all of the boxes, just change it to a sun lamp. 

If this is not what you were asking for, or I am not clear, please tell me.
Thanks!