No sound into headphones

I will make it quick : I have no sound in my headphones when they are plugged in on my Asus F200CA running Ubuntu 14.04, but :

• I have sound in the laptop speakers when the headphones are plugged out.
• If I boot up my laptop on a Live USB running Ubuntu 14.04, I have sound in the speakers and in the headphones.
• If I open pavucontrol, I can "see" sound, but I can't hear it.

I already did some of the actions listed here.

I'm running Ubuntu 14.04, with Unity, and this bug appeared about a week ago.

I had the same problem for days (on a different laptop). The solution was to do the following two things:

1. Reset user configuration (as described in the Troubleshooting section of https://wiki.ubuntu.com/PulseAudio).

2. Make sure Independent HP is Disabled in alsamixer. To do that, just type alsamixer in a terminal, then choose your sound card (by pressing F6) and move to the Independent HP column.

Hope it helps!