No sound output, but is recognizing device

Solution 1:

Have you installed the media codecs. It's common for beginners to forget to install the mp3 codecs. If not open up your terminal and type in the following

sudo apt-get install ubuntu-restricted-extras

Solution 2:

The 15.04 can be buggy at times. Have you done

sudo apt-get install build-essential

before installing PulseAudio? If not, do it. The audio functions too need essential libraries and compilers at time. Now I know this is basic, but perhaps, it may have been overlooked. It had happened to me a couple of days ago.

So next, check this:

1. Go to the dash on the top-left corner of your screen
2. Type in pulseaudio and open the pulseaudio volume control
3. Open an mp3 file and let it play while you check these two tabs. Check the options available one-by-one and select the one which allows you to listen to the mp3 file being played.
4. If/when you will have been successful in fixing your problem, go brew yourself a warm latte.