Volume on my laptop is not working help?

i have an hp laptop and the sound on it has stopped working, I went to the control panel and everything is fine and all its not on mute and the speakers are all the way up. also i checked the headphone jack and its not the cause of the problem, i cant listen to anything at all on my laptop. i have had it for a... show more i have an hp laptop and the sound on it has stopped working, I went to the control panel and everything is fine and all its not on mute and the speakers are all the way up. also i checked the headphone jack and its not the cause of the problem, i cant listen to anything at all on my laptop. i have had it for a little bit over a year.
please help
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