SharePoint Websites Doesn't Open

Hi,

In my SP 2010 farm I created a web application with FQDN. Then I created a site collection with FQDN port 80 and running on the SharePoint 80 application pool. 

Then I entered the FQDN in the DNS with IP of the host server. Then I also disabled the loopback checking and added a multistring value in the HKEY_LM\System\CCS\Control\LSA\MSV1.0 

Now My site collection opens and prompts me to Log in.

As soon as I log in, it prompts me to Log in again, and then again and then the process ends and the website doesnt even open.

Ive tried restarting IIS, restarting the server, been on this for a week now. 

It just prompts me to log in again and again and after 3 attempts it closes and the website doesnt even open.

When I try to open the website on other servers in the domain, after I log in, an error msg says troubleshoot errors with microsoft sharepoint foundation.

Please Help.

Thanks and regards.