my line-in doesn't work?

[Mint4Ever]

first off, it worked perfectly in mint 12 and I didn't change anything when moving up to ubuntu 12.04.

nothing plugged into the line-in jack plays on the system, not my satellite box, not my dsi-xl, not my boom-box. I checked the audio settings and it recognizes something plugged into it, even shows input levels fluctuating, but there's no sound, and no it's not muted or turned way down

[Mint4Ever]

4 day bump

[Mint4Ever]

8 day bump

[Mint4Ever]

12 day bump

[Mint4Ever]

19 day bump