Why does domain name not show but index.htm does?

After 5 years of top ranking domain name page - say www.mydomain.co.uk no longer ranks (after being on page 1). Have not even found the domain page in 1st 100 pages

However, www.mydomain.co.uk/index.htm still ranks although on page 4.

Why would the domain name page disappear?

Howard

 

Have your inbound links dropped? Are most of your IB links pointing to the www.mydomain.co.uk/index.htm file or the directory, www.mydomain.co.uk/

Have you been practicing any black hat / unethical techniques?

 

This post might give you a little insight. Not sure what you mean when you say "rank". Is that for a particular term or for your domain?