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MagsFlag for United States of America

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No Audio Output devices are installed

I have been getting this message, "No Audio Output devices are installed" with the sound icon in the task bar being x'd out.  I am working on a HP Pavilion dv2700 with Vista 32bit, sp 2.  All drivers have been downloaded, and in the recent past I was able to get sound.  I have recovered this computer from viruses and have gotten everything to work but the sound which has been an on going problem.  I have also run the recovery manager and downloaded the original Conexant hardware drivers.  Says it installed but still no sound.  I do not see it in the Device Manager or is it listed in Sound...it simply says,"No audio devices are installed."
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njsteele
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Reinstall the chipset driver for the motherboard, that has happened to me at least a dozen times and that always fixes it.
Oh I see you said you do NOT see it in device manager... If reinstalling the chipset drivers does not work, you should let Vista reconfigure without it to remove any loose ends.

Delete all audio and game controllers that are listed, reboot and enter BIOS, disable the onboard audio (or take out the sound card if you added a better one) and reboot again, let vista see your PC without the audio enabled and it will reconfigure your system.

Finally, reboot and re-enable the onboard audio/put back the add-on sound card and boot.  Vista should tell you it found new hardware.  Follow the manufacturer instructions (install from an exe, let vista detect it, install from windows update, point to driver files, etc).
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How do you disable the onboard audio if I need to?
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10023

I spent quite a bit of time researching this and the only daylight
I came across was this link which is a microsoft website targeting your problem
http://support.microsoft.com/kb/948481

They have a fixit tool from Microsoft that you can download
and run...

after that I was curious if you might want to try xp version of the driver...
try www.driveragent.com

It will scan and correct any driver issue as well as chipset drivers, microsoft hd audio device and so on..
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It says audio device is disabled...right clicked to show disabled devices and nothing show.
We have tried an xp version that has worked temporarily...but is not a permenant fix.

Updating the chipset driver.  The only audio is what came with the computer
It it possible that audio is disabled in Bios ....
tap key f1 or f2 while computer is booting or look for keystroke on screen and
 then access bios and see if audio is disabled
Make sure you save changes before you exit
Disable possibilities are via BIOS or Device manager.

+
Boot into safemode and Uninstall ur sound devices from Device manager
reboot in Normal Mode and Reinstall the latest Drivers
reboot again.
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Driver agent showed it as a disabled device...rebooting
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set bios to default...rebooted...music to my ears.  setting bio to default must have enabled the audio.  I will continue working with the computer and make sure it does not disable again.  Will let you all know tomorrow if it is continuing to work.  Thanks for your help everyone...esp 10023!  Hope this sticks!
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When turned computer on had sound...then after a while it disappeared.  Not sure why.  Rebooted still no sound.  Went into device manager no sound, video or game controller icon.  Went into system devices clicked on system speakers...no drivers, updated and said best drivers already installed even though it stills shows no drivers.  Closed and the sound, video or game controller icon reappeared.
Went into f10 - bios setup  options...in system configuration button sound is enabled...clicked on setup defaults...rebooted...now have sound again.  Question...why is the sound disabling??  f1 is system info and f2 is start up check...better bios update button?
A DV2700 has a lot of media hot keys and it came with a remote, maybe there is a key to disable the sound you might be pressing by accident?

No virus can disable the sound in BIOS, so it's not that.

Did it disable again since that one time?
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No buttons being pushed...remote in bay.  Disabled once more...f10, system config, save default enables it.

Still don't know how to get into bios with more settings...f10 is very vague.

in googling issue...suggestion was to update bios...what do you think...would that help??
It wont hurt as long as you don't shut down the laptop while updating the BIOS.

If that doesn't work, if it keeps disabling by itself their might be an IRQ conflict; if you see a setting in BIOS to allow the OS to manage resources, make sure you choose that.  You could also disable something else like the network card or other ports like serial/etc.

It could also be the battery, which retains the BIOS settings.  It takes a CR-2032 which gets spot welded to a special connector, CR-2032 batteries are about $3 at WalMart, if you know how to solder that's all you need.  Otherwise a replacement online is about $5 plus shipping.  That's a fairly common issue, but clock batteries usually last 3 to 5 years.

Here are instructions and a video on how to replace it (look at the instructions for replacing the real-time clock battery):
http://bizsupport1.austin.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=115&prodSeriesId=3559520&prodTypeId=321957&objectID=c01279892
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njsteele
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For advanced BIOS settings, HP removed this from the BIOS and placed them in a help and support program only accessible in windows (see the service manual, pg 119 for more details... link here --> http://h10032.www1.hp.com/ctg/Manual/c01295820.pdf)
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Thanks for all of the suggestions njsteele...just got back home.  I will update the bios first thing in the morning - can viruses affect the bios?  The computer had many that I have deleted.

Is there any way to test to see if it is the battery before taking it apart?
Viruses rarely affect the BIOS because they (BIOS) are so customized, I know of a few but they are from the late 1990s (i.e. CIH), and they simply wiped your BIOS or wrote random garbage to it, there was no way to "infect" them.

Now days most viruses are some sort of malware that add your computer to a bot network to do some sort of revenue generating garbage like emailing, clicking on ads in the background, that sort of thing.

Actual BIOS viruses are only theoretical currently, and it may stay that way as there is no "standard" way to flash a large variety of them.  Many people claim they have gotten a BIOS virus online, there are even youtube videos and wild claims in forums, but these are simply boot sector viruses, and the victim is not aware they even have a boot sector, much less that there is a virus in there.  Here is some further reading if you are interested.

http://www.tomshardware.com/news/bios-virus-rootkit-security-backdoor,7400.html
http://ask-leo.com/can_a_virus_infect_my_computers_bios.html

Currently there is no known BIOS residing virus according to McAffee, Symantec, etc., however, people have incorrectly associated viruses with similar names to be a BIOS virus (i.e. the BioHazard virus does nothing to the BIOS, but the similar name caused serious confusion among people who don't know much about the subject).

Basically, think of a BIOS virus like a laser gun; people know they are possible, but they are too hard to develop and there is no real drive for anyone to make them yet.

There is no way to test the battery besides replacing it, unless your BIOS has a feature that tells you when it's dying.
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Thanks for the virus info.

Well...I tried to do an HP Battery Check...It wouldn't run but when I tried the sound disabled instantly.

Ran Bios update with no luck.  Did my old trick start with f10, resort to default, f9 to save and rebooted and this time no sound.

Any other suggestions or is the internal battery my only option?

I really appreciate all of your effort!!
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After looking at the manual again I think I will go to our local electronics store, Radio Shack or Batteries Plus and see if they have an RTC battery assembly and not mess with taking it apart.  I'll let you know if this does the trick!
OK, I hope it works for you.  Did you also update your BIOS?  Besides the BIOS update and the battery, the only other thing I could think of that it might be is a hardware resource conflict, you could try disabling other things that use IRQs like the network adapter or any ports.
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Yes...ran bios update yesterday (see 2 above)...no luck.  I'll keep you posted.  Hopefully the battery change will do the trick...otherwise I'll try your other suggestion.  Thanks again, I appreciate your assistance!!
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No battery to be found locally with assembly...will need to order.  Could not risk no being able to use the computer at all.

Let me know if you want me to close out...it may be a while before I get the computer back and install the battery.

Thanks
That's up to you, I don't really care about the points here or anything.  I think you're allowed to leave it open for at least a week or more.  Maybe if you leave it open someone will have some exact experience with your particular model and knows this is something like the hard drive or something, but from experience repairing laptops, it sounds to me like the battery.
I have a HP G60-445DX that had no sound just like you. I tried new drivers, updated bios, nothing worked. I could get a crackle out of the headphone jack every once in a while, then sound every now and then but nothing. I found out the motherboard flaked out somehow and I had to send it in to get replaced.
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My client need to take her computer back to school before we could try new battery...Hopefully it will work.  Thanks for all your help!