Cannot load any file but PHP from the apache virtual host setup

I try to test my server on DigitalOcean with virtual host setup follow to this tutorial https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-virtual-hosts-on-ubuntu-14-04-lts

I did change my etc/hosts in my computer to match the virtual host for testing.

in the public_html folder, there is 2 file named file1.php and file2.html

I can access my http://test.com/file1.php but if i tried to access via http://test.com/file2.html the loading in spinning round and round and there is no return on that url.

It’s totally weird… all of the images file, text file, html file cannot access. But the PHP file is working fine.

I also have test with real domain and the result is the same.

Please advise,

Thank you.

---------- ADD VHOST FILE ------

<VirtualHost *:80>
    # The ServerName directive sets the request scheme, hostname and port that
    # the server uses to identify itself. This is used when creating
    # redirection URLs. In the context of virtual hosts, the ServerName
    # specifies what hostname must appear in the request's Host: header to
    # match this virtual host. For the default virtual host (this file) this
    # value is not decisive as it is used as a last resort host regardless.
    # However, you must set it for any further virtual host explicitly.
    ServerName test.com

    ServerAdmin webmaster@localhost
    ServerAlias www.test.com
    DocumentRoot /var/www/test.com/public_html

    # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
    # error, crit, alert, emerg.
    # It is also possible to configure the loglevel for particular
    # modules, e.g.
    #LogLevel info ssl:warn

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined

    # For most configuration files from conf-available/, which are
    # enabled or disabled at a global level, it is possible to
    # include a line for only one particular virtual host. For example the
    # following line enables the CGI configuration for this host only
    # after it has been globally disabled with "a2disconf".
    #Include conf-available/serve-cgi-bin.conf
</VirtualHost>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

And here is the apache2.conf file if it will useful http://pastebin.com/FQApfrPV