Drupal 7 custom module menu hook is not working
You need to change access arguments with access callback.

Replace following code:

$items['mydesk'] =  array(
  'title' =&gt; 'My Desk' ,
  'page callback' =&gt; 'show_mydesk',
  'access arguments' =&gt; TRUE,
);


With:

$items['mydesk'] =  array(
  'title' =&gt; 'My Desk' ,
  'page callback' =&gt; 'show_mydesk',
  'access callback' =&gt; TRUE,
);