Hello, I have the same desktop running Ubuntu 16.04.1 and I just finished 
troubleshooting of this problem. Last steps I remember and which should be 
solution was:
1] During troubleshooting I broke sound driver... so i did what is written here 
in my last comment: 

2] after aplay -l was showing card 0: PCH [HDA Intel PCH], device 0:
ALC3234 Analog [ALC3234 Analog] ... I tried both jacks in front of the
desktop case.

3] That on the right side was working, left one (one with the headphones
sign) wasn't. I opened Gnome ALSA Mixer and enabled "Headphone" and
sound starts working.

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  [OptiPlex 7040, Realtek ALC3234, Speaker, Internal] No sound at all

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