Matlab Startup Error (Main window is not loading)

Hello Everyone.

I am using MATLAB 2019a version. But MATLAB got crashed and I am not able to open MATLAB now.

Only a cross sign is comming as shown in figure.

I also tried to reinstall MATLAB 2019a and I also install MATLAB 2020a, but every time same problem is comming.

Please Help me

Thank you

[Sudhakar Shinde]

Can you add more details like:

1. Specification of machine

2. Installation and activation (license) done 100% without any error

Altrnatively you can open MATLAB by command promt:

And check if it works.