Hello can anybody help me with this small problem

Hello everyone
My name is Aadesh. I am new at Blender. I a stuck on a problem.
When I change my viewing mode to render view all my objects disappear and fade I don’t know why I checked my lighting is all are good but I am stuck at this problem. You can check this problem video on this link

If anybody who has knowledge about this problem please help me I will very thankful to you for this.

Is the light a point light or any light that is not a sun lamp, set at at least 10000? Or a sun lamp set at 1 or 2?