My page shows a grey page rank with no page rank information. does this mean my webpage is blacklisted since it disappeared from Google index also. I exchanged some links but they were all relevant categories in good directories.
No this does not necessarily mean your site has been blacklisted. If you type in your domain name into google (site:www.domainname.com) does any information come up? if so your site is not blacklisted. However there are other factors that could play a part in your page rank dropping.
If you can provide me with the domain name i can do some initial research and maybe get to the bottom of your negative ordeal.