Help, my computer no sound

Users questions: Boot the computer is silent today, while the speaker is fine, in the Device Manager can not see any yellow question marks, the MPU-401CompatibleMIDIDevice uninstalled, there is no question mark now, and how should I do? System Restore appeared small after the lower right corner of La A pair, there is no set mute, but still no sound. Diretsound test results: step 19 (user authentication software) on a fault HERESULT = Ox00000000 (error code)
Experts answer: estimated to have your sound card chip problem, it seems you need to hard Pieces of business where the check for a sound card chip is a problem! There may be sound card output interface a problem!
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