Intermittent Sound Issues - HP Pavillion dv6700 Entertainment Laptop

Hi,
I have a HP Pavillion dv6700 Entertainment Laptop running Windows Vista 32bit Home Premium and have been running into some strange sound issues first.
First, on occassion when I start my laptop I will get a "No Audio Output Device Installed" Message, and no sound controllers show up in the device manager. Strangely, sometimes if I restart the laptop or put it into hibernation and bring it back, the output device will again work.
Also, when it is working I am experiencing other strange issues. Often, sound will work only through headphones, and not through the built in Altec Lansing speakers. Other times, even with the headphones plugged in, I only get sound through the speakers. And sometimes, no sound through either, even though the computer at this point is showing a working audio device.
Lastly, when the sound does work through the speakers, it is normally crackling and distorted - it doesn't sound right at all.
The sound device installed on the computer is Contextant Smart Audio 221 (At least when it chooses to be working...)
I hope there is a solution to this problem, thank you very much for any support!
Message Edited by Holte2005 on 05-12-2009 02:52 PM

I also have a HP Pavillion laptop, with Windows Vista.. I am having sound issues, but not the same ones.. mine often displays the volume bar on the screen, clicking like I'm turning it up or down.. I can't get it to stop or go away.. I usually have to reboot and most of the time it stops, until the next time I open the laptop. Also, when it's not doing this, I can't control my volume from the touch pad volume control at the top of my keyboard. I thought maybe it was just damaged because it seems to have some scratches in that area where the top connects when closed, but I didn't think it made sense that rebooting will stop this, even temporarily. I have uninstalled and reinstalled the drivers, however, one driver didn't come back.. it actually seemed to be better at first, but now I have to reboot it almost everytime I open it. I thought if I didn't leave it in hibernation, just turn it off, while not using it, that would help, it didn't. I have also tried updating the drivers and they are updated.. If anyone knows what else I can do, please help, it's terribly annoying, plus I have a lot of music on it, I'd like to listen to it sometime.

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