It looks like you might need to add some error checking to your program. Something like the following will display the error text if the connection fails.
$dbh = DBI->connect("DBI:...", $user, $passwd)
or print "<p>Error connecting to database: " . $dbh->errstr . "</p
Look around the monastery for DBI tutorials. I've seen a few but don't have any bookmarks handy.
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