Solution Steps

1. Check USB connection or wireless dongle.
2. Replace batteries for wireless mouse.
3. Clean mouse sensor and mouse pad.
4. Test mouse in different USB port or on different computer.
5. Update mouse drivers: Device Manager → Mice → Update driver.
6. Re-pair wireless mouse if applicable.
7. Check mouse settings: Settings → Bluetooth & devices → Mouse (Windows) or System Settings → Mouse (Mac).
8. Restart computer if mouse stopped working suddenly.