Admin Menu appearing but no dashboard.. or anything else

Hi - I have an "update problem". The site at is viewable as a website to the public. However when I log in as ADMIN with all permissions, I can only see the topic menu on the Left hand side of the screen. The Right hand side is blank.
I have not tried anything yet, primarily because the RHS of the screen is blank giving no opportunity to update WP or disable plug-ins etc. The site is running an OLD version of WP
Has anyone any idea how to proceed please?