A high definition audio device may no longer work after you resume Windows Vista from hibernation or from sleep

SYMPTOMS
A high definition audio (HDA) device may no longer work after you resume a Windows Vista-based computer from hibernation or from sleep. The HDA 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. This problem occurs even though you have installed the update that is described in Microsoft Knowledge Base article.


RESOLUTION

This article contains an updated version of the updates. If you have installed either of the previous updates, and if the problem still occurs, we recommend that you install this update.

To resolve this problem, install update 937077.
http://support.microsoft.com/kb/937077/

To install this update, visit the following Microsoft Web site:
http://windowsupdate.microsoft.com