Its more than likely the sound driver
if you go to the hp support website(they also support compaq), and look for drivers find the sound driver or just click here
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=2093&lc=en&cc=us&dlc=en&sw_lang=&product=3546849#N633
now this is the vista driver but these do work in most cases all vista is, is just eye candy
its more than likely the sound driver
Maybe you not install all drivers on your laptop so that your sound not working...
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