dell xps 420 rear green jack not working?

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dell xps 420 rear green jack not working?

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Hello.

I have a Dell xps 420 and have used Logitech speakers since my purchase. However, recently sound has been missing. I have unplugged the speakers and put them into my smart phone and it was emitting sound, so it is not the speakers. I was wondering if it could possibly be the rear green jack that the speakers need? I'm also not sure if I have the correct sound card or am missing some sort of driver, and if that could be the cause, would like to know how to check and where to download. Thank you!

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