I have the exact same problem. if you keep your computer plugged in from start up, it works for me. or if you click out of hte program your trying to use then close your laptop so it locks, then open the program back up it works for me. its annoying and i dont know how to fix it, but thats how im surviving now.

Hello,

I have the same problem! and its driving me insane. When i turn on my sony vaio laptop the the startup audio works but when i want to play a song or watch a video it stops working and for everything else completely. One time i closed my laptop so it was locked and 5 min later i opened it, the audio worked. But that was just once and If someone knows how to fix this problem, please let me know because i need/want to fix this a.s.a.p.!! thank you.

Me too, I can't hear any sound from my sony vaio laptop that runs on vista. I found that if you defragment your computer it defragments the volume too, and sometimes it works. Most the tme it doesn't but apart of the problem mightg be because the users aren't defragmenting their computers. I've had my laptop for about a year now and i am constantly having that problem. I don't really know how to fix it sorry. It says that the sound is working and the volume goes up and down but nothing comes out. Start up is fine but after log in there isn't any volume. This needs to be brought to the attention of Sony and/or Vista. We need to find out if its just vista or if its viao.

What for you need to know serial number of your system?

Have the same problem on a vaio...!!!

In Device Manager are there yellow ! or ?.

And plz tell ur OS and the modell of ur computer.
Errare humanum est, perseverare diabolicum.

I too am in the same boat. Sound kicks in when I startup and maybe 5% of the time it works when I want to play something from an application but then usual quits. Poor Sony's...does anyone know how to reinstall your sound card from vista?

Ye i know what the problem is. if you look where the headphones go in there should be a little red light coming out of the mac laptop. the problem isnt to do with the software its the input. i hav the same problem. if you listen to it with the headphones then it will work. when the headphones come out it stops working again. if u look inside the headphones socket then on the right side there should be a little thing that should click back into place use a cocktail stick or something... but be careful!!!!

Hello,

U have to run the driver of ur sound card.
Tell the brand and the model of ur laptop and ur OS. I think I'll be able to give u a link to doxnload this driver.
Errare humanum est, perseverare diabolicum.

Hi
I have a sony vaio laptop,
It was working just fine yesturday but when i turn on the computer again it was already on mute.
so i tried to unmute it and it didnt unmute
and when i turn the volume up it only went up one and wouldn't go up farther, and when it went up one the little icon and it still stayed mute
so i went on sound mixer and it said "no audio device is installed"
i dont know what to do
can you guys help me ???
please
(oh if i spelled anything wrong sorry im a bad speller)