First of all if its a temporary problem, it can go away by restarting explorer.exe. If it persists just run the following command given below in powershell opened with admin rights.

Get-AppXPackage-AllUsers|Foreach{Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”}

Source: merabheja.com/how-to-solve-start-menu-not-opening-problem-in-windows-10

That method doesn't work for me and many, many others. I tried searching online and most of the sites suggest the same thing.

" Brand new Inspirion laptop "

:emotion-2:

If your purchase your Laptop less than 30 days, call dell by phone,tell them your software problem and remind them it been less than 30 days of the Laptop purchase.

However, if it have been more than 30 days then I like to suggest you use the Reset This PC (Keep my files) option on your computer. Please click on the link below:

https://youtu.be/eXaO_sw9a-U

I have initiated a return and replacement already. It is less than 30 days old.

This is a windows 10 glitch that can create eroor with your metro apps. I face the same error Windows 10 Start Menu Button Not Working with the below article. They can really share amazing information about this article you can easily fix this article with this link.

www.nextleveltricks.com/.../

Hi

Have you updated the Windows 10 OS to latest creators build ? If not do try that, else you can also read this tutorial written here that helped me before Windows 10 rolled out creators buildWindows 10 Start Menu Not Showing | Simple And Easy Solution

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Here is perfect guide to solve windows 10 taskbar not working

I found this community post on google and wanted to answer it. You can fix start menu by restarting your windows explorer or by creating a new user account. I found solutions to windows 10 start menu not working here. You can also read this post to fix this issue.