Not being an Apple person this might not be germane. I have found differences
with the cables that attach the monitor to the computer. I had one cable that
plugged in but did not work. It was lighter in weight and IIRC was missing a
pin. I think it worked on an IIGS but not on a LCIII I was testing. I needed
the heavierweight video cable with no missing pins to get the LCIII to come
up.
Both came up in color but needed different cables.
Don't know why. As I said I am not an Apple person, although I would love a
G3 or G4 to play with.
Paxton
Astoria, OR