Sql Server 2014 on a server 2012

I have a Server 2012 where i installed the SQL server 2014.. and for some unknown reason I change change the server to DC... when I reboot and sing in on the server well it seems like all my sql icon were gone..HOW bad did i screw-up?

Are you able to connect to SQL databases from the programs list?

Your question makes no sense to me. Did you attempt an in place upgrade and now SQL Server doesn't come up after reboot. Please make another attempt to explain.

Chen you say you changed your server to DC does DC mean domain controller?