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As soon as I boot up when the KVM switch is attached, the resolution changes to 800 x 600. Unplugging the KVM switch and connecting direct to the keyboard/mouse/monitor, and it reverts back to the original settings.
Why does this happen?
Obviously, I have changed the resolution back to the original while the KVM switch is attached.
Strange thing is, I have never had the problem of the resolution changing on a hardware KVM switch before.
DDC is a signaling standard that allows your monitor to tell the computer it's resolution and other characteristics.
I would first make sure that when you reboot, you've switched the KVM to that computer. If that doesn't work, you'll have to configure your OS to explicitly set the resolution, rather than using DDC.
It sure looks to me like the problem is DDC, since it works fine when you hook-up the monitor directly. The KVM is not sending the DDC to the video adapter.