OOPS...... Problem solved!!!!......... My partner has just twigged that the reason why I aynt gettin any sound in is because he had the optical out connected to his studio mixer when he was writing music on Cubase. Of course the mixer being turned off meant no sound to the speakers which stops the internal speakers from working.!!!!!!!!
Now I know what to unplug. I'm deciding as we speak what method I will use to slowly KILL HIM!!!!!!