by Rick Jerz.
Check the file permissions on your new (unzipped) moodle, and also on your copied config.php.
I think you can try "755" to see if it works. Check the Moodle docs to make sure about this, because maybe it should be "644". I see that most of my files are 644, but directories are 755. I can't recall if UNIX just does this on its own.
Maybe someone else will know for sure.