K520
If you have downloaded the soft ware from logitech and have run it then do so, mine would not connect until I did that, also recycle the on / off switch, If that does not work, contact Logitech, they should be able to help you.
SOURCE: logitech keyboard won't work
You may need to reinstall the drivers for the keyboard, they should have came on a CD with the keyboard, you may also be able to download the correct driver from Logitech's website. Try searching for 'logitech keyboard drivers' in Google or visit Logitech's own website.
Please rate if at all useful, thanks!
SOURCE: Logitech wireless mouse and keyboard
Normal
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Press the Receiver button (and the lights will start
flashing.
Then if the Keyboard isn't working, press the small RESET/CONNECT
button on the back of the board to connect the keyboard to the
receiver.
If the MOUSE isn’t working, push the small RESET/CONNECT button
on the back of the mouse to connect to the receiver. Then they
should work okay.
Hope this helps. Bud
SOURCE: Logitech Wireless CE 0682 Keyboard won't work but mouse does
did this come with software
and you might need to do a uninstall reinstall
if it worked on same pc before it should work now.
if you have a reset button on transmitter try resetting it.
SOURCE: my logitech wireless keyboard won't type. i
go to logitech support, download setpoint software and follow instructions on setting secure connection. i just did it with mine and keyboard got fixed. your symptoms should be that the qwerty keys dont work but the multimedia, clock and function keys are working. the setpoint software will take care of that.
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