I have a Logitech m325 mice with unifying, i cannot connect with 2400 cordless keyboard.

First, you must be sure that your Logitech mouse (M325, M325C or other) and keyboard and the USB receiver installed in your PC all have the unifying symbol ((orange star) on them. The star will be on the back of the mouse and keyboard as well as the on/off slider button for each device.

Now you need to make sure that you have the correct drivers installed for the mouse and keyboard. Believe it or not, even though they are supposed to be plug and play devices, the drivers may actually be listed as missing (especially the USB unifying driver) when you check them in the Windows Device Manager!

Download the Free version of DriverEasy, a very small and excellent program, install it and then run it to search for and identify which drivers are either missing, out of date or up to date on your computer. Then click on each driver you wish to install or update and follow the prompts. As you do this, be sure to click in the top menu bar in DriverEasy and it will change the information in that box to display an internet link to each driver. This is an important step and easily missed because Driver Easy does not make it obvious. They want you to download the Pro version to install the drivers automatically for you. The Free version works just fine as long as you find this link in the top menu bar. Carefully copy and paste this into your web browser and press enter to download and install each driver. Then check in Windows Device Manager and it should now show the drivers are installed and working properly.

Now go to the Logitech site and download their Unifying software, another very small program. Install it and open it to start pairing your devices. Click on Next in the bottom right corner and you will be prompted to turn the slider button off and then on each device. This may appear to do nothing if the device is already working, so simply go Back or restart the program and press Next again. But when you do this to a new mouse (or even a second mouse if you want one at home and one in your office) it should come to life and you must now move the cursor to tick the box confirming that the mouse is indeed working before pressing Finish.

If you wish to un-unify a device then you simply start the Unifying program again, but this time click on Advanced in the bottom left hand corner. This will display the devices that are paired. Click on the one you no longer require and then press UnPair and Finish. That's it.

This is in resonse to malware high jacker.

the OP mixed 2 wireless mice and keyboard/ mouse technologies, this will never work
1: bad batteries
2: use the drives form logitech or Microsoft only.
3: use the correct receiver, (they have 2 mixed and is dead to rights WRONG that)
4: RTM read the manual. dah"?


the mouse is 2011
the keyboard 2400 has mouse too and is 2006 made
the cure is kick the old keboard to the curb and use any wired keyboard
and then connect only the receiver from that new 2011 mouse.
it will plug and play. ok. (but is VISTA so gee, maybe not)

my guess is old 2400 mouse died
and bought the wrong mouse, that well never work with the 2400 parts ever.(mixed technology wirless)
Logitech m325