> I left a program running overnight. The next morning, even after booting
> back into Mac OS, the text was still faintly visible.

That should go away after a while, but I'd be careful leaving a static 
image for any longer on that screen if that happens already after just a 
night.

>>> While we're on the subject, what causes the weird diagonal lines that
>>> all RF-modulated signals have?
>>
>> Non-perfect electronics :-)
>
> Why lines though? Why not random snow or something?

Designing RF stuff is tricky as every part of your circuit will blast 
all the other parts with whatever signal is on it. I suspect it's just 
some interference or some component creating harmonics, and they just 
happen to manifest as diagonal lines.

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