It most likely wont show an error, but turn on display_errors in php.ini
/opt/cpanel/ea-php56/root/etc/php.ini
sh*t your running LS, do a "locate php.ini" look for LS's php.ini as it uses a different one, dont have a LS server in front of me to chk where it is.
log_errors to syslog
Restart lightspeed
Refresh the site.
Run this cmd from ssh & see if it spits out an error when you refresh
tail -f /var/log/messages
tail -f /var/log/apache2/error_log
tail -f /var/log/apache2/domlogs/domain.com
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