[support] Problem with recreating the site

Hi to all, I had some issues with hosting company and had to leave them. But I did download all files and made mysql dump (using phpMyAdmin). The site was made with Drupa 6. I tried to recreate the site on my mac mini (MAMP) but wasn't successful. I copied all Drupal files inside MAMPS/htdocs (didn't forget .htaccess) and created a database with the same name and imported mysql dump (using also phpMyAdmin). Then made the change in settings file (line 92: $db_url = 'mysqli://root:root@localhost/mydbname';) Result is completely blank page.

What am I doing wrong?

Thanks for any help, Afan