HElP with rendering

hey, i have a problem with blender, I’m trying to render a model but in render settings i enabled ray and pressed render (F12) and it says filling octree, and then it only renders an area about 1 inch square then stops!
Does anybody know what is wrong?!?

I don’t know what’s wrong, but if you have many reflective and/or transparent materials with high raydepth value they you have to to be more patient. It is OK that rendering takes long time in some cases, actually wrongly set up render parameters may prolong render times 10x sometimes.

if you wan’t speed and you have a duel core, set the threads to 2