When your mouse isn't working, there is usually a connection issue. The connection between the mouse and the Unifying USB receiver can be lost for many reasons, including:

• Low battery levels 
• Moving the receiver from one USB port to another
• Moving the receiver to another computer
• Plugging the receiver into a USB hub, KVM switch or other unsupported device  (NOTE: Your USB receiver must be plugged directly into your computer.)
• Using your cordless mouse on metal surfaces 
• Radio frequency interference from other sources, such as:
  • Wireless speakers
  • Computer power supplies
  • Monitors
  • Cell phones
  • Garage door openers

Before reconnecting your mouse

1. Try to rule out potential problem sources that might be affecting your mouse, including those listed above.

2. Make sure you have fresh batteries in your trackball. (For battery installation instructions, see Knowledge Base article 22501).

3. Check if the mouse is turned on. (For instructions to turn your mouse on and off, see Knowledge Base article 22516.)

4. Make sure the receiver is securely plugged directly into a working USB port on your computer.

5. Turn your computer on.

Reconnecting your mouse

NOTE: These instructions use Windows screenshots. Macintosh will look slightly different, but the instructions and messages are the same.

1. Download the correct version of Logitech SetPoint Mouse and Keyboard software from the M515 Downloads Page.

2. Launch the Logitech Unifying Software:
   • Windows: Start > Programs > Logitech > Unifying > Logitech Unifying Software

   • Macintosh: Application / Utilities / Logitech Unifying Software

3. Click Next at the bottom of the Welcome screen.

   

4. Follow the on-screen instructions to turn your mouse off and then back on.

   

5. When your mouse is detected, you'll see the confirmation message below. Click Yes and then Next.

   

6. Click Finish to exit the Logitech Unifying Software. Your mouse should now be connected.

   

Contact information

Need more help? see Knowledge Base article 22499 for how to contact Logitech Customer Care about this product.