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You are using the onboard sound, yes?
Go to control panel, then go to system, then to advanced tab, then to device manager. are there any yellow ?'s marks?
if so click on each one and fix according to the instructions it offers.
do you or have you had sound before?
Please update asap. there are many options available to you.
try plugging ur headphones in properly check for dust on the jack or ur plug or changing headphones. if ur headphones work properly on other devices but malfunction on ur comp, ur headphone jack mite have a problem. I hope this was helpful
have you checked the sound card from bios?is there everithing ok?have you checked the driver instaled in start/run/dxdiag?do you have a sound card onboard or a stand alone one?It may be damaged too. check all this after you are sure that in the operating sistem,windows lets say is everything ok from control panel/sounds and audio devices. if it is not a software problem,than your card must be replaced and for this visit a specialised Acer service.they will test and recomand you the best solution bye bye
Hello Please go to your control panel and double click on "sounds and audio devices" then click on "Advanced" in volume tab. Check if the volume is muted and uncheck it, also check if the volume level is low.
Also please ensure your if your speakers need to be pluged into electricity mains or if they need batteries.
If this solved your problem please rate this solution as "Solved" or ask here again in order to find another possible cause.