The light.

Roll or check the battery terminals. They can get corroded.

If you're using USB ports, power is limited and can be shared by multiple ports. This can cause device issues and slowdowns if the devices aren't getting enough power.

Try different ports, if you have others available, or get a powered USB hub. A powered hub will ensure that the devices all get enough power.

new one.

Might have gone awry, or you need to re-pair (hopefully, not repair) the mouse. If you use a dongle for Bluetooth, check it and any driver software.


I have a Bluetooth keyboard that balked until I hit some magic incantation. Happy ever after now.

Sometimes rebooting the computer is needed. I have a mouse that sometimes has to be pulled out and put back in the USB jack.

replaced every so often. A basic one isn't very expensive.