If your M600 mouse isn't working, the problem is likely a lost connection. The connection between the mouse and the Unifying receiver can be lost for several reasons, such as:
- Low battery levels
- Moving the receiver from USB one port to another
- Moving the receiver to another computer
- Plugging the receiver into a USB hub or other unsupported device such as a KVM switch (NOTE: Your Unifying receiver must be plugged directly into your computer.)
- Using your cordless mouse on metal surfaces
- Radio frequency (RF) interference from more powerful devices such as:
- Wireless speakers
- Computer power supplies
- Cell phones
- Garage door openers
Before reconnecting your mouse
Before you connect your mouse to a Windows computer:
Fix or rule out the potential problem sources listed above.
Turn your computer on.
Insert fresh batteries in your mouse. For instructions on changing your mouse battery, see answer 360023408553.
Turn your mouse on. The power indicator on the bottom should be green.
Plug the receiver directly and securely into a working USB port on your computer.
Reconnecting your mouse
To reconnect your mouse to a Windows computer:
Download the correct version of Logitech SetPoint mouse and keyboard software from the M600 Downloads page.
Launch the Logitech Unifying Software:
Windows: Start > Programs > Logitech > Unifying > Logitech Unifying Software
When the Logitech Unifying Software Welcome screen displays, click Next to continue.
Follow the on-screen instructions to turn your mouse off and then back on.
When your mouse is detected, you'll see the confirmation message below. Click Yes and then Next.
Click Finish to exit the Logitech Unifying Software. Your mouse should now be connected.
If this solution doesn't work after a couple of attempts, restart your computer and try the reconnection process again.
- Keep other electrical devices at least 8 inches (20 cm) away from the Unifying receiver
- Move the mouse closer to the Unifying receiver
- Move the receiver to a different USB port on your computer