THX, new chum! Did you get it up and running already? If so, share the how and why with the troops, that's the way we do it here.

My next suggestion would be to delve into that InstaTower's bowels and make sure that the little MoBo Video-Out board's ribbon cable was firmly seated and to "clean the contacts" with the 'ole in-out, in-out.

BTW, if you don't have one yet, snag a real Video Card for one of your slots. That way you can leave the MoBo set to 640x480 full screen output with VideoPlayer on one screen while you do something worthwhile on the KVM setup and switch back to both screens to play with the 6400.