Install drupal-modules: 1) http://drupal.org/project/ckeditor Download ckeditor 3.6 extract all files in /sites/all/modules/ckeditor/ckeditor (/ckeditor.js)

2) http://drupal.org/project/syntaxhighlighter Download syntaxhighlight 3.0.83 and extract all files in /sites/all/libraries/syntaxhighlighter_3.0.83 (/index.html) do not forget to configure the module and input filters. Read Module doc

Install ckeditor-syntaxhighlight plugin. 3) Download http://code.google.com/p/ckeditor-syntaxhighlight/downloads/list and extract all files. Be careful with the file path. It should be /sites/all/modules/ckeditor/ckeditor/plugins/syntaxhighlight/ (plugin.js)

4) Magic Code, add this lines in /sites/all/modules/ckeditor/includes/ckeditor.lib.inc after line 314 'plugins section'

  if (file_exists($editor_path . 'plugins/syntaxhighlight/plugin.js')) {
      $arr['syntaxhighlight'] = array(
          'name' => 'syntaxhighlight',
          'desc' => t('Syntaxhighlight plugin'),
          'path' => base_path() . $editor_path . 'plugins/syntaxhighlight/',
          'default' => 'f'
      );
  }
Configure a modified drupal-module in admin/config/content/ckeditor/edit/Full (or Advance) => Editor Apparence => a) Toolbar:

[
  ['Source'],
  ...
  ['DrupalBreak', 'DrupalPageBreak','Code']
  ...
];
b) Plugins Oh Yes, Turn On "Syntaxhighlight plugin"

SAVE! and test