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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.
Did the old keyboard plug into a PS2 keyboard socket (round purple connector) or into a USB port (flat rectangular connector)? Similarly, what type of connector is the new keyboard?
If it is the round PS2 connector you may have connected into the green PS2 mouse socket instead of the purple keyboard socket. Although the sockets are similar, they work differently.
If it is USB, then try moving it to a different USB port.
Try the keyboard on another PC.
If you cannot get it to work then replacement keyboards are very cheap.
Restart the computer with keyboard connected and try booting into setup to see if the keyboard is recognized by bios, if you can get into the bios, then this is an operating system related issue.
If the keyboard still does not respond even in bios, you may have a damaged PS/2 connector. If this is the case, it can be soldered by a technician or the keyboard can be substituted with a USB keyboard.
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 connector have you got on your keyboard. Is it USB or the older PS/2 type (round 6 pin purple thing?)
USB keyboards can be problematic when working with the BIOS. It is usually possible to enable a setting in the BIOS setup pages to enable them to work but, as you've probably guessed!) you need a PS/2 type keyboard to allow you to make the changes in the first place!
The other option is to by a PS/2 to USB adaptor. They should be available from any good computer shop.