Having problems with your Acer Aspire 5100 Notebook ?

No Audio Output Device is Installed

\015 My sound icon has an x on it, when I highlight the icon with mouse it states No Audio Output Device is installed. I went to Device Manager it doesn't even show no sound device. I have installed drivers but it won't work because it needs a sound card, I believe it is realtek sound card not sure.\015\012\015\012I also have the Acer 5100 Notebook, when I received the laptop the only CD they gave me was for Windows Vista Home Premium that is installed on my PC. Instructions stated to do a Back-up of all the programs and files on the PC before using it. I did that, so I have the back-up. If I run my back-up will it erase all my info on my pc? Will it restore my sound card?\015\012\015\012I believe this all started when Windows Update did a update this month the end of July, everything updated except one update, and that was the New Vista Service Pkg 1. So, I didn't think anything of it, so it required me to restart my computer, and then when the pc was up and running again I didn't have a sound device, I didn't notice it right away until I tried to open windows email, it wouldn't open. I tried playing songs on my media player no sound. So, I tried to do another Window Update, hoping it would restore my sound card. But it stated I had all the updates except one which was New Vista Service Pkg 1. \015\012\015\012Everytime I would try to update to that version it would stop in the middle of the update, and ask for the CD for Microsoft Word 2002, I couldn't find the CD, and the update failed. Window update wouldn't install the new version of vista. At first the Window Vista would not update to my pc until I removed XP version of Word 2002 from the Acer Laptop. \015\012\015\012So, I decided to uninstall Word 2002, rebooted, then updated to the New Windows Vista Service Pkg 1. no problem updated ok. So, I restarted my pc thinking it would restore my sound card. No sound card. Tried to do another windows update. Stated No Updates are Available at this time.\015\012\015\012I have been going to other forums alot more people are having the same problem. I went to Acer, and Realtek, no downloads for Sound Card, just driver, downloaded that, but still I don't have a sound card. I went to some sites, and they want you to pay them for downloading drivers, and sound cards. I'm not going to do that, so I guess I will contact Acer Support, and Realtek Support, and Defintely Microsoft Support.\015\012\015\012This is ridiculous. Especially since there are many people having the same problem. It has to be a bug in the new microsoft windows vista service pkg. 1 update.\015

Answers :

It seems to me that the sound card is either
  1. disabled in BIOS. Reboot, hit F1 or delete or F2 to got into setup. then look for "onboard Sound card" or On Board Audio" and enable it. OR...
  2. \015\012
  3. The sound card is either not plugged in right or dead!
I really doubt it's an update issue.

If you think it ought to work, uninstall all sound card drivers and reboot. If it detects new hardware, then it's a driver issue, if it doesn't, then the card isn't working and no amount of driver install or updating will help.
Everyone is pointing to your sound drivers when what is actually missing is as stated by Windows the Output device. Under the sound, video and game controllers heading in device manager there are always other audio devices besides your audio chip such as media control devices, audio codes, and legacy audio drivers, as well as some hidden ones. Windows will pass it's audio requests to one of these who in turn pass it along to your sound chip's audio driver. If one of these is missing then the chain is broken.
\015\012With enough knowledge and time one can possibly reinstall the missing components and get it going again but it's usually quite a painful process of trial and error.
\015\012In my honest opinion you are better of to backup your data, all the Acer's I've seen come with the harddrive split in two from the factory, a C: drive and a D: drive. Move all your data to the D: drive or use DVDs to back it up. Then use the Vista restore DVD that came with your machine to reload a fresh copy of Windows onto the system. This will put everything back in place as if you had just taken it out of the box. Once done all the audio components will be in place and you should be able to hear again.
\015\012If by small chance you sound chip is faulty on the motherboard then the same problem might come back, in that case if your machine is under warranty then request service at fixmyacer.com
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