i have moodle 1.9.x :
|Version de Apache||2.2.23|
|Version de PHP||5.2.17|
|Version de MySQL||5.5.23-55|
According to the Install guide at the following link you should be fine.
To find the exact problem with your Moodle you will want to Enable Error checking. This will display your PHP errors. Once you get the PHP errors, you can post them here so we can check whats causing it or have a developer look at it.