canonicals

Hi, guy’s not sure how this happened, but it appears that I have 2 web sites!! I have been under the impression that I was using http:/www.mydomain.com, however it appears that I aslo have https://mydomain.com. This second site I cannot access, when try the url it goes to a blak screen and just sits, so I cannot point it back to my https://www.mydomain.com. What can I do to get rid of the second site?

Thanks