How can I mend vtech challenger laptop?

My granddaughters vtech challenger laptop mouse will only move the curser sideways. The ball is freemoving. Can you give any advice?
Thanks
Stephen, September 2021


done
https://manualzz.com/doc/1110335/vtech-challenger-laptop-user-manual

Page 6

Make sure both encoder shafts are clean and rotate freely. You might be able to find general tips on ball mouse cleaning on YouTube etc.

Dfhy, September 2021
link Click here to see other fixes for VTech.