Pulseaudio isn't running, so it's probably crashing. Try to get a log:
https://wiki.ubuntu.com/PulseAudio/Log

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https://bugs.launchpad.net/bugs/1293833

Title:
  There is sound when booting up the computer, but once i log in to
  ubuntu, there is no sound, and there is no sound device in the sound
  applet

Status in “pulseaudio” package in Ubuntu:
  New

Bug description:
  when i open pulseaudio it says connection to pulseaudio failed

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: pulseaudio 1:4.0-0ubuntu6
  ProcVersionSignature: Ubuntu 3.11.0-18.32-generic 3.11.10.4
  Uname: Linux 3.11.0-18-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/controlC29', 
'/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', 
'/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/controlC0', 
'/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D7p', 
'/dev/snd/pcmC0D8p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Mon Mar 17 18:48:55 2014
  InstallationDate: Installed on 2014-03-01 (16 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 
(20131016.1)
  MarkForUpload: True
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  SourcePackage: pulseaudio
  Symptom: audio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/23/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 79CN46WW(V3.05)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058Std
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo G510
  dmi.modalias: 
dmi:bvnLENOVO:bvr79CN46WW(V3.05):bd12/23/2013:svnLENOVO:pn20238:pvrLenovoG510:rvnLENOVO:rnINVALID:rvr31900058Std:cvnLENOVO:ct10:cvrLenovoG510:
  dmi.product.name: 20238
  dmi.product.version: Lenovo G510
  dmi.sys.vendor: LENOVO

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