No Sound Card Detected (Dummy Output) in Ubuntu 13.04

Boot up my machine upon arriving home. No sound while playing YouTube. Suspected the Shockwave plugin was corrupted. Upgraded Google Chrome to the latest version. Still no sound, try playing local MP3 file, no sound as well. Check the sound settings, showed Dummy Output. It seemed no sound card was detected. Some googling and these are the solutions.

1. Uninstall, purged all configuration files, reinstall, and lastly reboot. [1]
$ sudo apt-get remove --purge alsa-base
$ sudo apt-get remove --purge pulseaudio
$ sudo apt-get install alsa-base
$ sudo apt-get install pulseaudio
$ sudo reboot

2. Reinstall the applet indicator.
$ sudo apt-get install indicator-sound
$ sudo killall unity-panel-service

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