After you resume a Windows Vista-based computer from sleep or from hibernation, a high definition audio (HDA) device may no longer work. The device may be a sound device or a modem. You may see an "X" character appear on the speaker icon in the notification area.
Because of this problem, you no longer hear any sound, or you cannot use the modem.
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To resolve these problems, install the update that is described in Microsoft Knowledge Base article 937077.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
937077 (http://support.microsoft.com/kb/937077/)
A high definition audio device may no longer work after you resume Windows Vista from hibernation or from sleep
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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