I cannot get a scene to render in blender I am using Blender version 2.74 with cycles and I have a scene that I cannot get to render. When I click render it will just stay on the viewport will just show a checkerboard and show no signs of rendering. It seems to be using all of the memory on my computer but barely any of the CPU. This must have something to do with the model because I can easily render other models. I have tried disabling all the particle systems on the one object I am rendering but still nothing will happen.  

Here is the link to the .blend if anyone is interested.

If anyone can help that would be very appreciated. Thank you.
Your ParticleSystem2 setup for your pebbles is what is bogging down the render. It's currently set for 30k particles with 100x children to render which I think is the source of your infinite render time.

I would cut down on the number child particles by quite a bit. I would also use a blend texture from foreground to background to effect the particle density so it would give me more particles near the camera and less particles in the background. You may have to apply the curve modifier to get the blend texture to work properly.

You could also use a pebble texture for the background pebbles instead of actual geometry particles, which will cut down on your particle count as well.