Repeatedly keeps me on login page

On clicking Login button it keeps me in on the login page. Neither goes to Dashboard nor shows any error messages.

Please suggest me if anyone knows the issue.
Thanks in advance.

Sometimes such a behavior can be seen, when the code is not able to successfully create a session. Do you get a session cookie from the server? Maybe also check the database table modx_session.

Does an error get added to the MODX error log (file core\cache\logs\error.log) when you try to log in?