SOLVE IT.

It is a problem with the domain trust.

So I created a local account, login using the LOCAL account, and was able to start SQL on single mode and connect using CMD.

Thanks all for your support.

PS: no idea how to solve that problem with the trust.

Now I added a Windows Group for all DBAs, but the DBAs can't connect to the server (get the trusted domain error) their account is not listed on the sysadmin group. Even though they are part of the Windows Group.

But that's another story for another post.

Miguel SQL