Audio Endpoint Builder Service Not Starting

Hello,

My system's sound suddenly stopped today. I checked the speakers and they are working fine. I also reinstalled the drivers but to no avail. I opened Windows Sound in Control Panel and there it mentioned that the Windows Audio Service wasn't working. I tried starting it and I got a message stating that one of the dependencies are not started. Of the three dependencies, Windows Audio Endpoint Builder service wasn't started. When I attempt to start this service, I get the following message :

This service's dependency i.e. Plug and Play is working fine. Event viewer shows the following entry for this failed attempt :

Code:

Log Name:      System
Source:        Service Control Manager
Date:          11-Sep-11 4:02:15 PM
Event ID:      7023
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Vrushank_Desai
Description:
The Windows Audio Endpoint Builder service terminated with the following error: 
The RPC server is unavailable.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Service Control Manager" Guid="{555908d1-a6d7-4695-8e1e-26931d2012f4}" EventSourceName="Service Control Manager" />
    <EventID Qualifiers="49152">7023</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8080000000000000</Keywords>
    <TimeCreated SystemTime="2011-09-11T10:32:15.674120000Z" />
    <EventRecordID>194706</EventRecordID>
    <Correlation />
    <Execution ProcessID="576" ThreadID="2592" />
    <Channel>System</Channel>
    <Computer>Vrushank_Desai</Computer>
    <Security />
  </System>
  <EventData>
    <Data Name="param1">Windows Audio Endpoint Builder</Data>
    <Data Name="param2">%%1722</Data>
  </EventData>
</Event>

Could someone please let me know what's the issue ?

Found the solution. It was the Power Service that wasn't listed as dependency but was required. I started the service and rebooted and I can hear sound again... :)