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1 Use the mouse on the same side of the computer where the Logitech USB transmitter is attached so there is a clear signal between the transmitter and the mouse.
2 Check the USB transmitter that comes with the Logitech mouse to be sure it is correctly plugged into the computer. The red LED should be illuminated on the transmitter if it is connected properly. If not, the signal cannot reach the wireless mouse.
3 Turn the mouse upside down to check the on/off switch. Be sure it is switched on.
4 Check the battery compartment by sliding the top housing off the mouse to confirm the rechargeable batteries are installed correctly.
5 Charge the batteries if the mouse LED does not illuminate. The charger cord plugs into the front end of the mouse and the other end connects to a free USB port on the computer.
6 Clean the desk surface or other flat area if the mouse is not tracking. The problem could be dirt or grease interfering with the tracking ability of the device.
7 Open the Logitech software called SetPoint, which manages the mouse, to troubleshoot button functions. Open the program by double-clicking SetPoint from the list of software on the computer, then click "Mouse Settings." Click the "My Mouse" tab and check (or uncheck) all the task boxes that are desired for operating different mouse functions, then click "Apply" and "OK."
I don't know your level of technical experience, so some of these may seem obvious. These may not be in the best order, I've added them as I thought of them.
1) check the batteries in the keyboard and mouse. They can go through batteries in a big hurry sometimes. If just changed double check polarity.
2) check the connection(s) for the receiver. If you have pets check for chewed wires.
3) have you added any new USB devices. They may be using to much power from your USB ports
4) have you added any other wireless devices, includes non-computer devices.
5) have you tried resetting the keyboard and receiver signal.
6) check USB power output. You can plug in a different USB device and see if it works.
7) does your receiver require batteries (very rare).
8) you may need to reinstall your keyboard drivers and software.
Most wireless keyboards operate in the 400 Mhz range so do most wireless networks and many phones, these can all interfer with your signal.
try this: plug in the USB key & check for the green light. Then go to start, control panel, & double click mouse (with whatever mouse works). Check the hardware tab and see it the computer is recognizing that the mouse is there. If it is there, it should be working fine. If not, then perhaps you need to reinstall the USB port drivers. Sometimes this will happen when you've upgraded from 1.0 to 2.0 USB ports.
Press the Receiver button (and the lights will start
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
plz check the batteries of your wireless mouse. try reinserting them or may be you can try a new set of batteries.also try to reset the connection on your mouse by pressing the connect button under the mouse and on the reciever together and releasing both together