If your Logitech mouse cannot connect to the Unifying receiver, you can try the following methods in turn: 1. Make sure the receiver is plugged in and recognized by the computer, try changing to the USB port or plugging it directly into the computer body; 2. Use Logitech Options or Unifying Software to re-pair the mouse and receiver; 3. Check whether the battery is powered, whether the power switch is on, and whether the pairing button is triggered normally; 4. Troubleshoot system compatibility issues, update the system, test other computers, and turn off antivirus software and other interference factors. In most cases, the above steps can be used to solve the connection problem.

If your Logitech mouse cannot connect to the Unifying receiver, don't rush to change the device. This problem is often not because the mouse or receiver is broken, but because there is some minor problem with the connection method, driver settings or hardware status. Next, I will talk about common investigation methods and solutions step by step.

1. Confirm whether the receiver is plugged in and is recognized by the computer

Sometimes the problem may lie in the most basic place - the receiver is not plugged in, or the computer does not recognize it at all.

• Unplug the receiver and plug it again to make sure it is tight.
• Try changing to a USB port, especially the port on the laptop that is away from other devices.
• On Windows, you can open "Device Manager" to see if there is a device that displays "Logitech Unifying Receiver". If not, it may be that the system did not recognize the receiver.
• If you are using a USB hub, it is recommended to plug it directly into the USB port of the computer body. Some hubs do not support wireless devices well.

2. Re-pair the mouse and receiver

Sometimes the connection between the mouse and the receiver is broken and needs to be repaired manually.

You can do this:

• Download and install Logitech Options or Logitech Unifying Software (the latter is lighter).
• Plug in the Unifying receiver and open the software.
• Follow the prompts to add a new device, usually you need to press the pairing button at the bottom of the mouse for a few seconds (some models have pairing holes near the battery compartment).
• The software will detect the mouse and complete the binding.

If you are not sure how to operate, you can read the mouse manual, which generally contains matching steps.

3. Check the battery and mouse status

This is an easy to ignore but critical link.

• Battery is out of power : Try changing to a new pair of AA or AAA batteries, especially if you haven't changed it in a long time.
• Power switch off : Check whether the power switch at the bottom of the mouse is on.
• Poor contact between the pairing button : Sometimes it doesn’t respond after pressing it. You can use a toothpick to gently push it to confirm that it can be triggered.
• Indicator light abnormal : Some mice will flash when pairing. If they do not respond at all, it may be a hardware problem.

4. Compatibility and system issues

Sometimes it is not a mouse or receiver problem, but a system level glitch.

• Update your operating system patches, Windows sometimes affects peripheral compatibility after update.
• Try testing the receiver and mouse on another computer to determine whether it is a device problem or a computer problem.
• If you are using a Mac, be aware that some older models of mice may have compatibility issues on macOS, you can try resetting NVRAM or SMC.
• Some antivirus software or security tools may also prevent the device from connecting, so try temporarily shutting it down.

Basically, these are the investigation directions. Most of the time, re-plugging, re-plugging, and re-pairing can solve the problem. If you try it all, it may be that the receiver or mouse itself is damaged.

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