Sidney, sorry to hear you too have this issue but good to have some company!  Strange no one ventures any theories because elsewhere in the 777 threads others have reported this same problem.  Screenshot shows a bright spot on the roof of the fuselage and suggest this panel light is perhaps in the wrong position.  NB: this is NOT the dome light.  Its the "panel" light switch to the right that I believe should be illuminating all the switches and labels with the green/yellow color.

https://s29.postimg.org/msqtmbd3b/77vc.jpgupload gif