Issues with publishing for web with a client

I have a client that i built a course for, they do not use an LMS but a webserver. I provided a very small sample published for web a few weeks ago and it worked without an issue. i delivered the actual project on friday following the same steps and they are only seeing a black screen when they launch the course on their end. I saw an old post about publishing to CD but doesnt seem thats an option any more. What should i do?