Lost sound!

[mahop]

I had my PC repaired and when I came to the task of putting all the plugs back into the back of the tower, I am left with a mauve/lilac plug and cannot find the sockrt to put it into! So I have no sound at all! How stupid can I be?
Can anyone indicate which is the sound socket on the back of the tower? You tube is not the same without sound!

 

[johnb35]

The cord from the speakers go into the green jack. The red color you have is for the microphone usually.

 

[mahop]

Lost Sound.

Thanks John.
I will change the mauve plug for another which will then fit in to the green socket!