Reuben

What theme are you using?

hmm…Just check if you inserted the code correctly in wp-congifg.php file…
Eg:-
define('WP_MEMORY_LIMIT','200m');

Did you restart apache after increasing the PHP limit?

neetij is right.

You have way too many unclosed tags. There are 36 div tags opened and only 34 are closed. Out of 31 p tags only 28 are closed. Out of 28 script tags only 26 are closed. Out of 78 li tags only 55 are closed.

I also suspect that you have called wp_head() function two times. The second time you have called it inside the body tag.

There are 3 404 not found scripts.

I suggest you to recode your theme.