I'm pretty used to blender, and I've never had any problem like this. I recently changed my workstation and now some projects aren't able to render. For example I have a project of a chair, with about 15518 vertex, and when I press the render button it just opens the blender render window and does nothing else. I tried letting it work for some minutes but I didn't get any result. I've noticed that when I try to start rendering Blender starts to occupy a great amount of RAM, till it's almost saturated. If needed I can give you more infos about how the system gets influenced by the "starting of the render". I really don't know what to do, please help me!