Post page problem

Hi everyone

Hi have been trying to solve this one but have not been getting anywhere.

The situation is that I am trying to setup WP so that posts will display on a specific page. the page has been selected in settings-reading-posts. However nothing shows when I go to this page. I think the problem maybe that I have edited the theme files and I have removed some needed code for this to happen.

Can someone tell me where I should be looking ie – file, part of file. Is there code in the header.php that is required for this?

thanks in advance