No audio device error in Compacq Presario CQ40 (windows xp)

Hi,
I found that no sound from my laptop model Compacq Presario CQ40-337TU. I can't play any songs and video and the error show that no audio device installed.
Model: Compacq Presario CQ40-337TU
P/N:MN564PA#UUF
Window XP SP2
Please help me.... Thank you~
This question was solved.
View Solution.

Hi
You have a couple of options as I see it.
First disconnect the Battery & Ac Adapter then press and hold the power button on the unit for 30 second then check by powering on the unit.
Go to device manager and uninstall the driver and restart and unit will install the driver automatically.
Try doing System restore to the date when the unit was working fine.
Try to update the driver from hp.com website for Audio & Bios.
Let us know how it goes!
*Although I am an HP employee, I am speaking for myself and not for HP.
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Regards
Manjunath
Let us know how it goes!
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