Mic is not workin in my desktop available: unknown

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http://askubuntu.com – I am using ubuntu 12.04 Desktop. Mic is not working. I tried same mic in different place,that is working. This is out put of 'pacmd list-sources' Please help me. root@vijay# pacmd list-sources Welcome to PulseAudio! Use "help" for usage information. 3 source(s) available. index: 0 name: <alsa_output.pci-0000_01_00.1.hdmi-stereo.monitor> driver: <module-alsa-card.c> flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY state: SUSPENDED suspend cause: IDLE priority: 1050 volume: 0: 100% 1: 100% 0: 0.00 dB 1: 0.00 dB balance 0.00 base volume: 100% 0.00 dB vol (HowTos)