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There can be several ways to enable/disable audio on a computer.
The sound may be muted within the operating system. In Windows XP: Click Start -> Control Panel(or Settings -> Control Panel). Click Switch to Classic View in the top-left corner. Open Sounds and Audio Devices. Verify the volume and verify Mute is NOT checked. Click the Audio tab. Verify there is a Default Device. Click the Volume button and make sure nothing is Muted.
If everything there checks out OK then check the Device Manager. In Windows XP: Click Start -> Run Type devmgmt.msc -> click OK Verify there are no yellow exclamation or red x icons anywhere. Specifically in the Sound, video and game controllers section.
You should not need any additional hardware - but you may have to install a driver (software).
If you just bought the keyboard it should have come with an installeation disc. If you don't have that you can go to the following Logitech website and peform the auto scan function (your new keyboard should be attached via USB cable.
This scan will detect the keyboard and tell you if you need any additional drivers installed.
You may need to check your BIOS setting. The mouse be disabled there. You can access the BIOS thru the boot menu when your computer frist starts up. If the mouse is active as a usable feature, then you may have to a hard boot of your operating system with the OS(Windows Vista, XP, 2000, etc.) Cd you recieved with the computer. If that does not work, then you will have to a complete reinstall of your operating system.
First check the Device Manager and see if there is a problem with the device driver. If you see a yellow! or a redX, then right click on it and choose to update the driver. In fact you may just update the driver anyway, it will not hurt anything. If updating the driver does not work there is not much else you can do with a keyboard; they are pretty simple machines. You may have to just replace it.