Can't access template page--node--1.tpl.php by its path
If you're getting a 404 for the path "node/1" then that node doesn't exist, so the template will not be run for it. A template file will only be applied to a path that actually exists.

You just need to get the nid of an existing node and replace the id in the template file name with that, e.g.

page--node--2.tpl.php


where a node with a nid of 2 actually exists in the database.

Don't forget to clear Drupal's caches anytime you add/remove a template file so the theme registry gets updated.