Site not showing up on all computers

Hello, I have installed my site and it works great on all computers but the one I real need it on, my mac pro. I installed it using my laptop and the site works well,
works on the g/f’s laptop and phone but not the Mac in my office.
I just get, “server unexpectedly dropped the connection”.
I have cleared cache, dumped the cookies, flushed the dns….
When I install a index.html on the server it works fine. So i know it will connect to the site.
I can also connect using just the numbered address but the page is unstructured.

Dose it work for you? http://www.paxtonimaging.com

Any thoughts?