Windows 7: "no audio output device installed" please help

Hiya, so my problem is that i have no sound, haven't had for a while now.
When i hover over the speaker icon it says "no audio output device installed".
I've tried going to device manager and beside where it says "Realtek AC'97 Audio" is a yellow triangle with an exclamation mark inside. I have tried clicking update driver software and scan for hardware changes.
I have been googling this problem for ages to try and find a solution but anything i can find doesn't work. If anybody could give me any suggestions on what might be wrong and how to fix it i'd really appreciate it.

I don't know much about the computer, it was given to me and i'm not much of a computer wiz. But if you need to know anything i will try to answer.

Thanks.

Hi Jodie

Are you running Vista or Win7? What version?

In the 'start search' box type dxdiag. When the icon shows up at the top of the list, click on it to open it. Next let it download a .txt file
Click the "Save all information" button. A little icon that looks like a notebook page will be put on your desktop. Copy and paste the information from that log and post it in this topic.

Have you run windows update? usually it will download the software and drivers for any hardware that doesnt have a driver with it.

Hello,
i have the same problem.
------------------
System Information
------------------
Time of this report: 7/4/2009, 16:24:55
Machine name: IBM
Operating System: Windows 7 Ultimate 32-bit (6.1, Build 7260) (7260.win7_rtm.090612-2110)
Language: Lithuanian (Regional Setting: Lithuanian)
System Manufacturer: IBM
System Model: 266871G
BIOS: Phoenix FirstBIOS(tm) Notebook Pro Version 2.0 for IBM ThinkPad
Processor: Intel(R) Pentium(R) M processor 2.00GHz, ~2.0GHz
Memory: 2048MB RAM
Available OS Memory: 2046MB RAM
Page File: 750MB used, 3342MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7260.0000 32bit Unicode

------------
DxDiag Notes
------------
Display Tab 1: No problems found.
Sound Tab 1: No sound card was found. If one is expected, you should install a sound driver provided by the hardware manufacturer.
Input Tab: No problems found.

--------------------
DirectX Debug Levels
--------------------
Direct3D: 0/4 (retail)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)

---------------
Display Devices
---------------
Card name: ATI MOBILITY RADEON X300
Manufacturer: ATI Technologies Inc.
Chip type: ATI Radeon Graphics Processor (0x5460)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_5460&SUBSYS_056E1014&REV_00
Display Memory: 830 MB
Dedicated Memory: 63 MB
Shared Memory: 767 MB
Current Mode: 1400 x 1050 (32 bit) (50Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: unknown
Monitor Id: MS_0000
Native Mode: 1400 x 1050(p) (50.000Hz)
Output Type: Internal
Driver Name: atiumdag.dll,atiumdva.cap,atitmmxx.dll
Driver File Version: 7.14.0010.0630 (English)
Driver Version: 8.561.0.0
DDI Version: 9Ex
Driver Model: WDDM 1.0
Driver Attributes: Final Retail
Driver Date/Size: 12/1/2008 20:29:34, 4033536 bytes
WHQL Logo'd: Yes
WHQL Date Stamp:
Device Identifier: {D7B71EE2-1720-11CF-D271-6425A1C2CA35}
Vendor ID: 0x1002
Device ID: 0x5460
SubSys ID: 0x056E1014
Revision ID: 0x0000
Driver Strong Name: oem5.inf:ATI.Mfg:ati2mtag_M22:8.561.0.0ci\ven_1002&dev_5460
Rank Of Driver: 00F62001
Video Accel: ModeMPEG2_A ModeMPEG2_C
Deinterlace Caps: {6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
{6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
{6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
D3D9 Overlay: Not Supported
DXVA-HD: Not Supported
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Enabled

-------------
Sound Devices
-------------
Description:
Default Sound Playback: No
Default Voice Playback: No
Hardware ID:
Manufacturer ID:
Product ID:
Type:
Driver Name:
Driver Version:
Driver Attributes:
WHQL Logo'd:
Date and Size:
Other Files:
Driver Provider:
HW Accel Level: Emulation Only
Cap Flags: 0x0
Min/Max Sample Rate: 0, 0
Static/Strm HW Mix Bufs: 0, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No

---------------------
Sound Capture Devices
---------------------
-------------------
DirectInput Devices
-------------------

i am having the same exact problem even after i downloaded all the updates for my sound blaster audigy se

i had that problem when windows 7 was in its earliest beta stages.
eventually around build 7100 realtek put out an update (through MS update) and it 100% fixed the problem. and ever since that i kept upgrading the builds to now where i have 7201
I did notice, however, that when i did a clean install of 7201, 7264 and probably everything in between, that I couldn't get the driver anywhere and gave up after pretty much months from searching early on

check this out if i better explained it, or if anyone has any solution to it:
Weird issue with Upgrading vs. Clean Installation

My HT Omega Claro Plus is kicking azz in all builds .....

Has drivers out for w7 both flavors 86 64...also has the newest cmedia "oxygen" chip..just a hint for those shopping for a new card. Hope u above get ur problems sorted, though!

Tried latest drivers from Realtek yet?

big link: Realtek

tinyurl: TinyURL.com - shorten that long URL into a tiny URL

Try Going to your start menu and serching windows update and update there and all of your drivers should be succsessfuly downloaded. You may have to restart once or twice but thats fine. And WOULA your sound should work beautifuly!! Trust mea i had the same exact problem. It really frusterated me!! But try this out, if you havent already!

if your specs are correct tho, you're using build 7100, and like i said in the message i made like a month ago, it stopped being in windows update sometime.
unforunately i just realized i've got conexant hd audio.

my xp driver is the same, so the big question is, can someone running an older build w/ the same audio card send you that driver???
or in my case can i save this version that is working on older builds and use it on newer ones?