First: I would consider myself an advanced beginner in terms of administration. I know enough to be dangerous to myself and my projects :)
I have an addon website hosted at HostGator. The HostGator server basically treats addons like subdomains, but presents them publicly as separate websites.
I installed Joomla! 3 in a folder in the addon domain's directory. I did this automatically using QuickInstall.
After building the Joomla! site, I changed the addon domain's directory root to point to the Joomla! folder, so: public_html/addonwebsite.com now points to addonwebsite.com/joomla
I can see the new site home page (Joomla site home page) when I go to addonwebsite.com, but none of the other Joomla site pages work. Also, I can no longer access the Admin panel.
Any thoughts on what's causing this and how to rectify would be appreciated.