Hotfix available if your audio device is missing after a restart (KB975538)

Audio devices are missing or are displayed as "Not plugged in" after you restart a the computer that is running Windows 7 or Windows Server 2008 R2

“You have a computer that is running Windows 7 or Windows Server 2008 R2. You connect an audio device to an HDMI endpoint on this computer. At first, the audio device works correctly. However, after you restart the computer, you cannot hear any sound from the audio device. Additionally, in the Sound window, the status of the corresponding audio device is "Not plugged in."

Read more at the full KB article (KB975538)

get more help on sound and audio problems in Windows 7

• Tips for fixing common sound problems
• Open the Playing Audio troubleshooter
• Sound cards: frequently asked questions

Rob

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