You need to check that your sites_enabled is pointing to the right place (on linux - /etc/apache2/sites-enabled/default.conf). But if your second attempt worked, then I imagine it is.
When you go to the site, what address is showing your address bar? Do you get to any Moodle page at all - does it look like a Moodle error page? It sounds like it might be so...
I would try the following. Turn on full debugging, you can do this in your config.php - google for instructions on how to do that. Hopefully that will tell you what is going on. I have had errors where a table got corrupted in the import but a quick repair on it got the site back. Hopefully debugging will point you to the problem - if there is a permissions error somewhere, it might show you where.
Triple check your config.php - I have had issues with a stray / or errant character in my config.php which was enough to shut down the whole site.
If that doesn't work, I would try redumping and reimporting the database.