This problem is likely to be a lost connection. The connection between the mouse and the Unifying USB receiver can be lost due to several reasons, including:
- Low batteries
- Moving the Unifying USB receiver from one USB port to another
- Moving the Unifying USB receiver to another computer
- Plugging the Unifying USB receiver into a USB hub or other unsupported device such as a KVM switch (your Unifying USB receiver must be plugged directly into your computer)
- Using your cordless mouse on metal surfaces
- Radio frequency (RF) interference of more powerful wireless devices such as:
- Wireless speakers
- Computer power supplies
- Cellular telephones
- Garage door openers
Eliminate any problem sources mentioned above that might be affecting your mouse.
Before connecting your M505:
Make sure you have fresh batteries in your mouse. For battery installation instructions, see Knowledge Base article 360023386273.
Make sure the mouse is turned on. For instructions on turning your M505 on and off, please see Knowledge Base article 360023386273.
Make sure the Unifying USB receiver is directly and securely plugged into a working USB port on your computer.
Turn your computer on.
Follow the procedures below to reconnect your mouse.
Re-connecting your M505:
To re-connect your M505, do the following:
NOTE: The following instructions use Windows screenshots. Macintosh screenshots will look slightly different, but the instructions and messages are the same.
Download the correct version of Mouse and Keyboard software (SetPoint) from the M505 Downloads Page.
Launch the Logitech Unifying Software:
Windows: Start > Programs > Logitech > Unifying > Logitech Unifying Software
Macintosh: Application / Utilities / Logitech Unifying Software
The Logitech Unifying Software Welcome screen will appear. Click Next.
Follow the on-screen instructions to turn your M505 off, then on.
When your M505 is detected, you will see a confirmation message. Click Yes, then Next.
Click Finish to exit the Logitech Unifying Software. Your M505 should now be connected.
If the above solutions do not resolve your problem, consult Knowledge Base article 12347 for instructions on contacting Logitech Technical Support.