I cannot hear sound through my iMac Headphone port,

I cannot hear sound through my iMac Headphone port, this is a very new computer. I can hear sound through the usb port of the device. How can this be fixed? Headphones are selected as an Output device.
Please help in any way possible, it is becoming quite a concern as it was just working a matter of hours ago.

usb does not carry audio at all it's a serial digital bus
things one connect to usb which play audio act the role of being usb audio cards only 1 audio card can be active at the time so if you connect an usb audio card the internal audio card is muted
this cause your headset to be muted
disconnect the usb audio card and you will be able to use your headset
if you wish to use a headset an an usb audio card at the same time the headset needs to be connected to the usb audio card

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