How to solve the problem of mysterious Toshiba keyboard failure.

　1. Open the control panel and find the Ease of Access Center.

2. Turn on "Make the keyboard easier to use".

3. If "Enable filter keys" is checked, uncheck it and save. If you need to set it, click "Set Filter Key" under "Start Filter Key".

4. The filter key function is not commonly used, and it is recommended not to enable it, otherwise it will cause inexplicable keyboard failure.