No Sound In Headphones Dell studio 17

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http://askubuntu.com – I recently decided to try Ubuntu. I made a dual-boot installation on my Dell Studio 17. The audio plays just fine through the speakers, but will not play through the headphones. Only one of the head phone jacks is acknowledged as an output source. Please help. I am new to Ubuntu so step by step instructions would be preferable. Thanks. (HowTos)