Why has my headphone never worked in the blue labelled connection that appears to be made for it?

I have a Dell Inspiron 4300 and that connection has a drawing of a headphone. When I want to use my headphones I have to plug out the main speakers and plug the headphones into the red speaker connection.

Answers:
Blue is microphone on my PC.
Maybe the headphone was damaged.
because its a dummy socket an also they change the sound socket from blue to green

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