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If it is a PS/2 keyboard (the one with the purple connector), your laptop has to have a PS/2 port, if not, you need an PS/2 to USB connector. If the keyboard is USB, just hook it up to the USB port of the laptop, and you're set!
Keyboards connect several ways. Older systems use a PS/2 connector (round) that plugs into the purple/gray jack on the back of the computer. The mouse plugs into the green jack next to it. If you have a USB keyboard, it plugs into any USB slot. PS/2 connections must be made with the computer off. USB connections work any time. If one slot doesn't work, try another. If the keyboard doesn't work, try another.
Is your keyboard connected via USB (a flat rectangular connector), PS/2 (A round connector, often it is purple), or AT connector (a round connector that is roughly twice the size as the PS/2 port for your mouse)? More than likely, it's connected via USB. Especially if it was bought within the last five or six years. If it is a USB keyboard, try plugging it into a different USB port and see if that helps. If that doesn't help then most likely the cord on your keyboard is damaged (kind of like when you have a pair of headphones that will only sound on one ear unless you jiggle the wire). If it's not the USB port (or you have a PS/2 keyboard) I would recommend you buy a new one. You can get one for as cheap as $10.
This is an older model so it is probably a ps/2 connector(purple) which you will have to turn off the computer 1st, plug it into the purple slot on the back and then turn on the pc.
Try the keyboard on another computer, if it works it is not the keyboard. If it doesn't then chunk it and get a new one.
You could get a ps/2 to USB and use that if the keyboard works. You shouldn't even have to buy one, as I am sure that someone you know has one of these converter plugs lying around.
If it DOES work and you have plugged it in accordingly to the original computer it is possible that the slot is faulty. Get a can of air and blow out the slot. If it still will not work then replace it with a USB keyboard and be done with it.
What type of keyboard are you using? Is it a PS/2 or USB type of keyboard? If it's a PS/2 keyboard (with round purple connector), you may need to restart the computer after connecting it to the computer. But if it's a USB keyboard, there's no need to restart the computer because USB is just a Plug-n-Play device.
You need to isolate the problem. If you're using a USB keyboard, try connecting the keyboard into different USB port of thecomputer. Or try different computer to see if the keyboard is still functioning or not.
If you got the same problem after pertorming some test, it's better to consult the computer manufacturer for second opinion.
You need to have the keyboard connecter (purple) connected to your computer in order for the KVM switch to recognize it. The computer is providing some power through the keyboard connector and this is what the KVM switch is feeding on.
If you have a USB keyboard, you may want to change your KVM for a USB compatible one. If you just want to use the KVM to switch your monitor, you may plug the keyboard (purple) connector of the KVM to your computer's keyboard PS/2 port and also connect you USB keyboard directly to your computer. It should work.