How Do I Gain SysAdmin Access Without Having a SysAdmin Account? Situation:
We recently had a consultant company build new Lync 2013 Servers in a mirror setup.  There are two security principles set, SA (disabled), and a AD group that is only associated with the Public server role.


  Setup:
  - 6 x Windows Server 2012 R2 Standard 64-bit
  - 4 x SQL Server 2012 Standard w/SP1 64-bit (11.0.3128) -
  - 2 x SQL Server Express 2012 64-bit(Witness)
  - All servers are VMware VMs


Questions:
 - Is there a Jedi trick to gain SysAdmin access or will I have to contact our consultant?
 - How does this happen?  I thought there was some sort of failsafe to
   keep this from happening.
Yes there is please follow below Microsoft web resource.It requires you to have admin access to windows machine and then start SQL server with -m option and create login in SQL server and grant it admin privileges.

http://msdn.microsoft.com/en-us/library/dd207004.aspx

Hope this helps