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Check your PHP logs; if there is an error occurring it will be printed there. There should be a button in the MAMP app to open the PHP error log on the main PHP tab.
 
Check your PHP logs; if there is an error occurring it will be printed there. There should be a button in the MAMP app to open the PHP error log on the main PHP tab.

thanks Guiyon, I dont see the button, but I check on the files and see the php.log and I dont see any error for today... the last error was a simple error

[02-Mar-2009 00:46:22] PHP Fatal error: Call to undefined function get_header() in /Users/Home/Sites/Studio/site/index.php on line 1
[02-Mar-2009 00:46:49] PHP Fatal error: Call to undefined function get_header() in /Users/Home/Sites/Studio/site/index.php on line 1

what happend :( thats so strange, the app runs well but dont load the php, I change the document root too and nathign .... help
 
I would also suggest checking your Apache logs, there may be something of interest there as well. Other than that, I'd try replacing your "index.php" with a really simply script, just to rule out any problems with the interpreter.

Code:
<?php
phpinfo();
?>

That should print your current PHP environment information when you access it. If nothing shows up there I'd double check all your settings.
 
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