Imho. You clearly do not know what you are doing.
Suggest you review your backups with all speed and hire a professional.
If you cannot get all "root" passwords this is going to be a difficult job for the professional.
Basic advice. Do not type anything on the keyboard on this computer. Spend your time finding the Sales Order documents for the Server and Operating System and any media or documentation which might help the professional. Finding the media is very very important.
Don't hold your breath.
Maybe update your CV ?