MacBook Pro 15" won't see DVI display behind KVM switch

I have a Gefen single-link DVI switch connected to a 24-inch Dell display. My MacBook Pro will detect the display if I connect it directly to the MacBook Pro's Mini DisplayPort to DVI adapter, but if the KVM switch comes in Detect Displays finds nothing.
Is anyone else able to get their MacBook Pro involved with a KVM switch?

Turns out the cable I was using had pin 16 pulled out on it (for most of our systems using DVI KVM switches this was a good idea). I connected a full DVI cable and then MacBook Pro saw the display.
Then came the problem that when switching AWAY from the MacBook Pro the MBP would act like the display was disconnected, reconfiguring itself to go back to its built-in display only. So then I connected a Gefen DVI Detective between the MBP and the switch and then the MBP would behave as desired, still "seeing" the display even while I was switched away from it.

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