KVM Switch + Linux + Shuttle box

I got a shuttle FS40
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http://www.ocworkbench.com/2002/shuttle/ss40/ss40p1.htm
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which I am using with a KVM Switch (an IOGEAR 4-Port MiniView one)
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I can boot Windows XP and/or Linux/Debian/knoppix up or shut it down
fine using the KVM Switch. The thing is that there seems to be some
sort of hard and/or software impedance of the shuttle with the KVM
Switch
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if I run say the cheatcode "knoppix memtest" I can see the multicolor
memtest run on the monitor without any problems, but if I let knoppix
start by itself I don't see anything on the the monitor if I switch to
the knoppix box
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How can I fix this problem?
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lbrtchx