Beean Cosmin Eugen posted an answer for this Roku Televison & Video:
"By the description you made it's seems the led lights in the back off the screen are..."
Beean Cosmin Eugen posted an answer for this Kyocera FS-920 Laser Printer:
"I had the same problem with the Kyocera P2135dn: missing developer unit. I have cleaned..."