Here are the tips to fix no sound problem:
1. Double-click the sound icon in the lower-right corner of the
desktop. This loads the audio options menu onto the screen. Make sure
none of the audio options are set to "Mute." If they are, uncheck the
options, and the sound returns.
2. Disconnect any headphones you have connected to the "Line-out" port
on the Acer laptop. If headphones or anything else is connected to the
line-out, the audio is not going to be produced by the computer's
3. Connect your computer to a local power source. If the battery is
running low, the laptop often stops producing audio as a method to
extend the battery life.
4. Download updated drivers for the Acer computer. If the sound drivers
are out of date, the audio is not going to project from the speakers
properly. Navigate to the Acer website, choose your country of origin,
then click "Service and Support." Click "Driver Download" in the left
corner of the screen and click the kind of computer you have. Choose the
exact make and model of your computer and all of the available drivers
are displayed. Click the audio driver and it downloads to your computer.
Double-click the downloaded file, then follow the prompts to install
the updated driver. Restart the computer and the audio now plays
correctly on the system.
Read this article: No sound on Acer Computer