I am not sure if the is is the right forum for this post. (I hope a friendly moderator will move it to the correct place if I have put it in the wrong place) My System I have two machines that share two monitors by the use of two KVMs. They both use Nviria GeForce vraphics cards (with twin DVI outputs) One machine is Win 7 Pro X64 and the other is Win 8 Pro X64. Both have the latest Nvidia drivers. Both are full retail legal versions of the OS. My Problem. When I switch between machines I usually lose one screen and it cannot be reactivated without a reboot. Sometimes the other screen reverts to its default resolution. This happens on every switch over with Win 8 and sometimes with Win 7 but not always. I have discoverd that if I switch the 2nd screen forst and then the main KVM (which has the keyboard and mouse) then usually the Win 7 machine continues to see both screens. The Win 8 machine virtually always loses the primary screen (the mouse and keuboard attached to this KVM are unaffected and switch correctly always) I suspect this might be an nvidia problem but short og buying a new graphics card I have no way of detemining this. Any senisble suggestion would be appreciated. By sensible I mean ones that do not include only useing one machine at once or only one sreen at once.