[ubuntu] aargh! KVM box troubles

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http://ubuntuforums.org – Hi Since having no success trying to network or remote desktop with my Ubuntu & Windows machines, I bought a KVM box & leads, so I can at least use both machines without having to unplug & reconnect the monitor every change. Connected it all up the first time today & IT ISN'T WORKING!@ The keyboard & mouse work fine on both machines, but the monitor, while it shows the boot up stuff OK & goes thru to show the desktop on both machines, says "Out of range!" on both of them. Can't make it work. In the past, if I've been switching between machines, having to unplug & reconnect the monitor, *sometimes* when I switched it while the computers were on, it would come up with "Out of range!" & I resolved it by rebooting the machine. I thought it was some discrepancy between settings for Windows & Ubuntu. Now I'm not so sure. BTW, did try rebooting too. Any suggestions?? Please?? TIA! (Hardware)