Speakers and headphone not working

Have  Optiplex 3020 MT service tag

and getting message

QUOTE

Audyssey

This device is not supported

 Realtek HD Audio Manager

UNQUOTE

Internal speaker working OK but headphones and external speakers not working

Dell manual says Intel Realtek ALC3220 High Defination Audio is installed

Driver updated by windows device manager to

Real Semiconductor

22/09/15

version 6.0.1.6086

All help welcomed