No Audio Device for HP Pavilion dv2945SE

#1
About 2 years ago I purchased this laptop, it was a refurbished DV2945 Special Edition. About a year or so ago, I installed a copy of Windows 7 32Bit Ultimate on this laptop, it was running fine untill at about last november. Suddenly the sound cut out, it says no Audio Output Device is installed, I downloaded and installed the driver for Vista, but it said that it could not detect the speakers or something, sometimes the sound is back, but after a reboot it was unusable again, any tips/suggestions on this?
 


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