Experience with odd KVM behavior?

Has anyone had this issue before?

I have a server that will show a display with some KVMs, but not others.
It works with an older Avocent KVM rebranded for Dell, but will not work
with a Belkin, Linksys or newer Avocent KVM. So far as I can tell, it is
not a cable issue.

Does anyone have any suggestions?

Best Regards,
Dennis Little

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