Dummy output - no sound in Fedora 17

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It seems like the sound hardware in your computer is not being detected.

You might want to check the output of the dmesg command to see if you find any errors regarding sound hardware.

You can also check the output of the lspci command to see how the sound hardware appears there.

In both cases, it may be helpful to search on the word "audio".

The Fedora wiki also has an article named How to debug sound problems.