Sharepoint 2010 Foundation administrator permission gone

Question

Hi all experts;
today, we found that the administrator privilege  on Team Site Owners suddenly gone.  All administrators under this group is no longer to manage the Sharepoint site and the users cannot add and edit any new or existing files.
It affect the domain adminstrator account too,  any way to fix it?
Symptoms, under Home page of Sharepoint 2010 foundation, my own user account and the administrator account cannot change the permission on user account.  No Sharepoint Designer feature listed, etc.

Answer 1

you dont need to rebuild the sharepoint for this, rather the restore the Content database just before when it was working fine.
I would check at SQL Server, if Content DB is marked as readonly. also check from central admin if site collection is locked as read only or other. could you please confirm it?
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