No Audio Output Device is installed - Win 7 - DV9925NR ENTERTAINMENT NOTEBOOK PC

[justwanttohelp]

I have had this problem for about 3 months. I tried every suggestion on the internet. One day my girlfiend was scanning pictures in my laptop and it overheated. When it cooled off the sound worked. I was stoked. Worked for about 10 minutes. My mom also has a dv9925nr laptop so I tried my hard drive in her computer. The sound worked, the drivers were working, so it wasnt a software problem. By the way, we are both running windows 7. I did some research on you tube to see how to reflow solder on a motherboard and how to disasemble the hp dv9000 laptop. It took me about 2 hours to tear it down, reflow, clean the fan and reassemble. The sound has worked for about 2 weeks and is still going strong. I also got a chill pad to keep it cool so it doesnt get hot enough to melt the solder on the motherboard and lose connection on the sound card again.  This fix has also worked great on my PS3 and XBOX 360.  Heat the board slowly and evenly with a heat gun so it doesnt warp. If it warps when it cools it will take its original shape and screw it all up again. It needs to be sitting level and you will have to get it relly hot. Watch some youtube videos on this before you try it or just buy a new motherboard. This also fixed my dvd drive that wasnt working. Just wanted to put my story out there because so many people are having this problem and I know how much of a pain this can be. GOOD LUCK.

[comp0tech]

Totally agree with Justwanttohelp... I've had this notebook for about 3 years now and loved it until about a year and a half ago.  Dust clogged the fan output and would overheat and shut off.  Soon after sound would stop, or not even show up. I'd get the "No audio devices found".  I'm a computer technician, so taking this thing apart was no problem.   I was about to replace the motherboard but found a $25 usb sound card that worked fine for about a year until it over heated.   Now I decided to fix this audio problem, no matter what.  After reflowing the motherboard. sound and sd card slot work perfectly. I got so happy it finally worked that I started using it with our screwing it back together.  bad idea,  a few days ago, "No audio devices found"  I reflowed it again... and bingo.  everything working.    The problem seems to be holding the notebook in the bottom left had area.  It causes the board to bend and undo a soldered connection somewhere on the board near the left side ports.   I heard a poping noise when bent when sound didn't work.   no click when bent and sound works.    

[Tcat]

The fix is to uninstall the Audio driver that's automatically installed by Win7. It's HP's stupid policy to get people to buy new laptops so they don't give out the driver, but Lenovo is cool to give it out on their website. Use the conexant hd audio driver for Win7

http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS002860