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It seems that you KVM switch is not working properly. computers connected to a KVM switch are not dependent to each other. you should be able to work on any of your computers while the others were turned off.
I have installed several of these KVM switches before... that's not normal. It sounds like there's a manufacturer's defect which is causing the video to link up with the wrong keyboard/mouse cables. If you just bought it, I'd recommend returning it and getting a replacement.
Solution for the mouse. I have 8 KVM's. Most of my computers work with the KVMs. On 1 inland KVM the logitect and Microsoft optical mice do not work on one computer (but work with the other computers). They both are USB. I hook them up with a USB to PS2 adapter. If I use a ps2 ball mouse connected to the KVM the mouse works. All the Mice work if I directly connect them. Since I do not want a ball mouse I got a Frisby optical PS2 mouse. It works with all the computers on the KVM's.
I do not have a solution for the Keyboard yet. 1 computer (ASUS MB) on my trendnet or belkin 4 postion KVM does not recognize the keyboard.
I have similar problem. 2 inland KVM's (both have PS2 inputs, one has USB outputs) do not light or recognize my usb mouse with a PS2 adapter. They do recognize a PS2 ball mouse on the KVM's however. One of the computers (Sony vaio 1.5 GHz) does recognize a usb mouse with adapter on 2 other KVM's (Old Belkin and a Trendnet) (the second computer I have not tried in those configurations). Next I will try an optical mouse with a PS2 fitting. That did work with a fifth KVM at an auto business last week.
Is the LED for position 1 and 2 always on? If the switch doesn't detect power on the PS2 keyboard connector it won't let you switch to to that position.
If you are using a USB mouse with an adaptor or a wireless mouse try a conventional PS2. I have a MS wireless mouse one of my switches does not like and have to resort to that sometimes.
Another issue could be excessive cable length or PS2 extension cables.
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