Hello,
You can try some methods to trouble-shoot the Start Button not working issue, for example, check for update, Update drivers, Restart windows explorer, etc…
- Press the Windows logo key + I to open Settings.
Select Update & security > Windows Update , and then select Check for updates. Install any available updates and restart your computer if required.
- Press Ctrl + Shift + Esc to open Task Manager. You may need to select More details at the bottom of the window to see everything.
Select the Processes tab.
Scroll down to Windows Explorer, select it, then select Restart.
The process may take a few seconds, and your taskbar and Start menu may not be visible while Windows Explorer restarts. You can close Task Manager when the process is complete.
Here is an official document for your reference: