I assume you checked out the keyboard by plugging it into another computer?
Follow "cherwoh"'s advice. If that doesn't work, I would check to see that your BIOS settings haven't changed. Maybe the motherboards PS/2 or USB ports have been switched off?
Also check the BIOS battery. This provide the power to store all of your BIOS settings when your computer is off. When the battery dies (every 2-4 years) it will reset your BIOS to default on every reboot, or can cause some strange behavior...
Is this a USB or PS/2 keyboard? If it is a PS/2 then the port that is integrated on the board is not working. If it is a USB, try plugging it into another USB port and see if it will work. If it does not work on either port then the ports on the system board are not working. It means u're having some malfunctions on the system board itself.
If it is a USB keyboard and it is that the USB ports integrated on the system board are not working, buy and install a PCI card with USB ports. It should work then.
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