Thank you. I will try that.

You can shutdown the server using command. You can refer below link for various options available. For shutdown command is shutdown /s

https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/shutdown 

Does these shut commands should be entered at DOS prompt? I tried while the server is on desktop but no use. TIA.

ok thanks. i will try that.

You need to run on command prompt

I tried to enter cmd prompt, either the search option or start button does not do anything after I click on them. So whats the next step?

As you are able to open folders using mouse, you can traverse to system32 folder under windows folder and open cmd file to open a command prompt.

Thanks everyone who suggested various options to shutdown my server. This opens up my next question - why is the 'Start' button on windows is not working either with the mouse or keyboard?

Hi, then could you please try to search something like this? This isn't a Dell material, so I'm just trying to give you an example. https://dell.to/3lGKtW5