a strange problem with index.php

[Matveyich]

hi.
i liked everything about this forum.
everything works properly on my local server(windows).
but i have a problem in the internet.(FreeBSD)
after i had installed forum i see that my index.php doesn't work at all.
i see just a blank page(looks like nothing happens). but ssi_examples.php works correctly.
you can see it here: hxxp:www.arhar.hut2.ru/112/ [nonactive]
i'm using the 1.1.2 ver. of smf.

need help.