OK, so a freaky thing just happened, which I have no natural explanation for...
...the color is back on my SNES gameplay.
Like I said earlier, I have no knowledge of circuitry, so all I did was open the case and take some of the screws out to look at the motherboard. I didn't unplug anything except a silver box at the top right, and re-plugged it straight after. At one point I dropped it by accident, onto the dining room floor from about 4 feet up. There was a small hairball in the case, which I removed...but that's it.
I gave myself a headache with that pesky Eject spring, but short of a miracle, I honestly don't know how it was fixed. All I know to say is "glory to God", and leave it at that.
