CakePHP installation problem in new domain

Hi All,
I am using CakePHP for last 1 and half years and had no such problems until when I started moving my website to another domain. Here whenever I am trying to access files under ‘webroot’ folders, it says ‘The website cannot display the page’ with an HTTP internal server error. I have tried to access phpinfo file but
that also doesn’t display and have same error. Anyone know what may be the issue with the server which is causing this error? Please suggest any change that is needed in server settings so I will suggest the server guys for that.

Thanks in advance.