Error: Access Denied – SharePoint 2010

The following are the Troubleshoot steps:

 1) Check whether the user is added into the Central Administrator.

 2) Check whether the user is added into the particular Site collection .

 3) Delete all the user from the "UserInfo".table

 4) Open the DB then open the table called "UserInfo" and check the 'tp_Admin' is true or false. If it's false make it as true.