For what it's worth:
I have a good collection of micros. Many are Casio. The green screen disappears once a signal is imputed, or a common problem the OFF/VHF/UHF switch is bad or needs cleaning. Giggle the switch and the image pops in and no green screen.
Other times, the set just needs to "wake up" for several minutes after power is applied.
Battery compartment cleanup usually works.
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