Problem installing wp on localhost after wp-config.php editing

I have some problem with the installation of WordPress on my pc.
First of all, I’m using XAMMP and, since my port 80 was already busy, I changed it with 8080.
I describe in detail all I did
(I’m using Firefox, but I have the same problems with IE and Chrome):

1) on my browser I did http://localhost:8080/phpmyadmin/ and created a new database
DB Name: unimadb

2) I went on the directory
C:\xampp\htdocs\unimawp
and renamed wp-config-sample.php into wp-config.php

3) I edited wp-config.php like this

define('DB_NAME', 'unimadb');
define('DB_USER', 'root');
define('DB_PASSWORD', '');
define('DB_HOST', 'localhost:8080');
define('DB_CHARSET', 'utf8');
define('DB_COLLATE', '');

4) On my browser:
http://localhost:8080/unimawp/wp-admin/install.php
and now, nothing happen.
It spends minutes (like 5/10 min) in loading the page but it stays blank.

Would someone help me, please?