My Highend WordPress theme is preventing my site from going live.

Hello. My name is Gordon. I currently have Highend as my WordPress theme and I recently set up a single page/splash page, only it doesn’t show anything but a blank white page when I visit the url (imaginaryfriendagency.com) in another browser window. I can see the page in my admin where I’ve built it, but only there. I already contacted my website hosting company (Hostgator.com), and they assured me that the problem is a theme based one. I’ve attached an image of my dashboard where you can see the page is published. Any help in making this live would be greatly appreciated? Thank you in advance.