This problem is likely to be a lost connection. The connection between the keyboard and the USB receiver can be lost for several reasons, including:

•  Low battery levels

•  Moving the USB receiver from one USB port to another

•  Moving the USB receiver to another computer

• Plugging the USB receiver into a USB hub or other unsupported device such as a KVM switch (NOTE: Your USB receiver must be plugged directly into your computer.)

• Using your wireless keyboard on metal surfaces

• Radio frequency (RF) interference from other wireless devices, such as:

  • Wireless speakers

  • Computer power supplies

  • Monitors

  • Cell phones

  • Garage door openers

Try to rule out these and other problem sources that might be affecting your keyboard.

Before connecting your K750

Before connecting the K750 to the Unifying receiver, check the battery level by pressing the Check-Light hotkey (shown below), located above the numpad near the ON/OFF switch.

If you see a:

• Green light

  Follow the reconnect procedure.

  

• Red light

  Charge the battery until the green light comes on before reconnecting the keyboard.

  

Make sure the USB receiver is directly and securely plugged into a working USB port on your computer. Then, turn your computer on and follow the process below to reconnect your keyboard.

To re-connect your K750:

1. Download the correct version of Logitech SetPoint Mouse and Keyboard software from the K750 Downloads Page.

2. Launch the Logitech Unifying Software (Start > Programs > Logitech > Unifying > Logitech Unifying Software).

3. When the Logitech Unifying Software Welcome screen displays (shown below), click Next to continue

   

4. Follow the on-screen instructions to turn your K750 off and then back on:

   

5. When your K750 is detected, you'll see a confirmation message, as shown below. Type a test message in the field provided to verify that the keyboard is working.

   

6. 6. Once you have confirmed that the keyboard is working, select "Yes" and then click Next to continue.

7. Click Finish to exit the Logitech Unifying Software. Your K750 should now be connected.

If you are still having the same issue, see Knowledge Base article 20596 for how to contact Logitech Technical Support about this product.