Quote: from Sailor CW at 10:11 am on June 15, 2008
If the keyboard & mouse came with a CD, you'll have to install that onto your computer. If not, you'll have to make sure the receiver (that's the part that connects to the computer) is hooked up properly, then press the 'connect' button. After that, press the 'connect' button on the keyboard (usually on the bottom) and on the mouse (also usually on the bottom). You may have to push the 'connect' button on the receiver and keyboard/mouse at the same time in order for it to work. 
Also be sure the USB port is working and the receiver is plugged in fully. Sometimes you have to "train" it a few times. Also, unplugging and plugging in the receiver and/or a reboot is sometimes necessary. Where I work we have about 50 of these and we end up having trouble with one or two a week.
http://www.logitech.com/index.cfm/support_downloads/&cl=ca,en?WT.ac=pt|3741
has support but you'll want to have yoru model number ready
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A Parent, old geezer, and occasionally right. Good judgment comes from bad
experience, and a lot of that comes from bad judgment.