I don't know what to tell you. It looks like you are Rendering an indoor scene with Exterior: Sun Only and a bunch of missing Appearance Images. What do you expect? GIGO.
Take it one step at a time and isolate the problem
Lights and Light Groups exist
Check Exposure
Lighting Fixture IES & Light Source
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Check what @barthbradley told you earlier...You are rendering Exterior Sun Only... Select Sun and Artificial >>> Render >>> then adjust exposure if it is black or too dark
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Sorry, but I can't view the two Solutions you awarded herein. All I see when I try, are these two completely sanitary screens.
I'm betting it has something to do with my own ineptness, but I'm not sure. Could you please help me figure out why I'm getting sanitary screens when I try to view the Solutions?
Never mind. Found it! Light switch was on the wall to the left side of door - not to the right side. Arrgh!