Its sounds like you have a two part problem.The local admin password changing baffles me.I have seen the case where administrators dont realise that it does not get changed with user manager routinely and stays the same throuought the life of the server....unless you specifically set the domain selection to \\localmachinename. Are you certain this isn't the case?/
The raid 5 array concerns me. If someone used nt to compose the raid array using regular old domain administrator , your security token is invalid on the new domain, plain and simple. For any type of nt raid, even on nt wkstn,you must have a valid sid
token to access the object to administer.I have been burned on this one with "spanning"
I assume that a trust was not established before disconnect to pass over ownership?