Cordless keykeyboard went dead have changed

After experiencing this same problem, and trying all the solutions noted here, I bought a new transmitter on Ebay for about $10. That worked for me.

If you changed the batteries to new ones and you still can't use it, try downloading the drivers from the website. If you still can't use it then that means the keyboard is bad and would need to be replaced.

After replacing the batteries you have to select the operating channel, so keyboard and receiver operate in the same frequency. Push the button on the receiver, and before 10 sec, push the small button on the back of the keyboard. Repeat procedure for mouse, just in case.

Hit the reset button on the keyboard or on the transmitter so you can pair the keyboard with your pc.