The Macintosh IIci shares its RAM with the on board video,

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So, then, it's conceivable that intermittent RAM could manifest itself as a lack of activity on the built-in video, because it can't initialize it's share of the memory (due to some kind of damage in the area it normally occupies), while still allowing the machine to boot normally, correct?

Only bank A needs to be fully populated with 4 x SIMMS, you don't have to fill both banks, but they do need to be of the same capacity and speed.

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They all look the same (I think they're 4 MB pieces), and I think I put them in bank A (because the machine wouldn't operate at all otherwise).
I could try filling them all up (the machine was configured with 4x1 MB in bank A and 4x4 in bank B originally, so maybe I'll try that).

Thank you,

c