DBCC CheckDB Consistency error on a empty table
It would be a lot easier if you post what error are you getting?

Usually the corruption was already there in the 2000 version but the latest and improved version of DBCC catches the errors that werent reported by the 2000 version of DBCC. Usually running DBCC UPDATEUSAGE might fix it and if the error doesnt go away you have to check what the specific error is and try to solve it accordingly. For all things CHECKDB i suggest you dig into all paul randal checkdb related blogs.