Have you tried booting with the known working VGA monitor, then swapping over to the greyscale 9"?
Nope - got scared something was shorting out - also sleep isn't working and I didn't feel like hot swapping would be a good idea.
With the Geforce card, is there a utility that allows you to specify which port is used for the primary monitor?
Just the standard OS X Displays prefpane
the cable for the monochrome monitor and see if pin 9 is present.
Nope - as marked on the table above.
Second thought:
The sense line on Pin 12 should be grounded in a fixed-frequency VGA monitor. Pin 12 was reused as the i2c serial bus line on VESA DDC. / Perhaps the Mac's video card freaks out at having that line pulled to ground
Ahhh - you might be on to something here - the greyscale does have pin 12, and the colour one does not. I'm resisting the temptation to snap that pin out and going to wait till I can make up an adapter to test this theory.
