Blank screen with no error messages on new server
In case anyone else is struggling with the same problem, here is how I could partially solve it and open the site without the white screen.

In the settings.php file I commented out this line:

// $conf['memcache_servers'] = array('localhost:11211' =&gt; 'default');


So if you are using Memcache and are moving to a new environment, try the above if you encounter a white screen problem.