sound not ok

[Manuel Chacón Romero]

Regards. I installed Debian Xfce 8.2 jessie 3 times . In the three times the 
installed sound to work. After installing these applications : Gufw , ClamTk , 
icedtea , GEARY , GPARTED , SHUTTER , Kolourpaint , KEEPASX , GNOME - 
PACKAGEDIT & CHROME sound stopped working and although I installed codecs and 
pulseaudio again the computer loses sound.
I do not know what to do. Any help? Thank you.
Manuel