The rendered window in VRay is black


#1

I’m sorry if this is too basic a question. My scene was rendering fine till last night. But I might have inadvertently changed my settings when I reopened my file this am because now when I render, the image screen is black even when the render status shows “Finished”, some of the suggestions on the web ask you to make changes under the “common tab”…cannot even locate that. Any help is much appreciated