I have a Dell Optiplex 780 running Ubuntu 11.10. Recently I had to hard reset that PC. After that restart, my audio device was no longer detected. Previously, audio had worked fine. The audio/speaker icon in the right hand corner cannot change volume as no audio device is detected.
The sound card is provided by the on-board Intel ICH-10 chipset.
00:1b.0 Audio device: Intel Corporation 82801JD/DO (ICH10 Family) HD Audio Controller (rev 02)
I tried logging in to both my own user account, as well as root. No audio device is detected. What are my options to troubleshoot this problem?