Sir my notebook is saying that the device driver couldn`t be found so sound is not working what should i do?
You did not mentioned your OS.
Anyway you can download and install the driver for your sound card from the following links and revert back:
Windows Vista
http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=2093&lc=en&dlc=en&cc=us&lang=en&product=3739778
If you have XP then also you can try the same driver
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