Drupal Custom Login Page Using Zen Sub-theme
I think your problem is that you're confusing the login block with the login page in the preprocess function and tpl names

try

function Alphasys_preprocess_user_login(&amp;$variables) {
  //a capitalized theme name?
  $variables['rendered'] = drupal_render($variables['form']);
}


then change the 

$hooks['user_login_block']


to

$hooks['user_login']


and drop in your print statement into the tpl

&lt;?php print $rendered ?&gt;


and you should be good to go