John has bought an expert system to help him find faults in computer systems.

John has been asked to look at a computer that won't play music through some external speakers, attached to a computer using a USB port.

• The music is stored in a file on the solid state drive (SSD).

• The computer uses a sound card to output sound.

• The external loud speaker is plugged into a USB port.

a The expert system asks John a series of questions. Each question is dependent on his response to a previous question.

Write a further series of questions that helps John identify that there is actually a fault in the external loud speaker plugged into his computer.
b Describe three other uses of expert systems.

is there anything showing on the screen? Yes Can sound be heard through internal loudspeakers? No is the computer switched on?