1. Are your speakers plugged in to a power source? 2. Are they turned on? 3. Is the volume turned up on the speakers? 4. Are your speakers plugged into the (usually green) audio port on your computer?
5. Go into control panel, sounds and audio devices and check to make sure that sound is not on "mute". 5. On the Audio tab, check to make sure it shows a default sound device for each item. If not, either your sound card is malfunctioning or you need to download and install a current driver from the Acer website.
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Actually, it's more the speakers, you can have the greatest sound card in the world, but plugging in a 10 dollar set of pc speakers is not going to sound good. That's why a good motherboard has Optical SPDIF Out Port, so you can put the sound to a receiver.
It's HD 5 channel, but likely your sound blaster is better.
When you connect headphones to your computer the computer will only send sound through the headphones and not allow sound to come out of the speakers. this is the way almost all audio drivers are setup, it detects the speakers and the headphones as 2 different devices and will only play sound through one (headphones first and if there are no headphones then speakers).
The only way I know to resolve this (and I hate this suggestion) is to purchase a headphone splitter. Connect the speakers and the headphones through the splitter, the quality of the splitter will determine the quality of the sound.
You could try going to the audio driver options (if there is any program installed by the audio driver) to see if you can get it to play through both but with both my Acer laptops I have been unsuccessful.
It's usually the green plug that you hook up speakers to. If you look closely at the sound card area of your computer, you will see little pictures telling you which one is for the mike, line in & speaker.
Although some monitors have built in speakers, most people have stand alone speakers. If the old monitor had built in speakers and now it is unplugged you won't hear sound. Even if the speaker cable is still plugged into the sound output on the back of your computer, the monitor must be plugged into an electrical outlet to have power.
I'd recommend buying a new set of external speakers if this is the situation.
If you never had speakers built into the monitor then normally changing monitors would make no difference whatever. The only explanation that makes sense under those conditions is that in the process of replacing the monitor, you dislodged the speaker jack from the sound output on the back of the computer.
Make sure your external speakers have electrical power plugged in, the power is on (green light on at least one speaker lights up) and the volume on the speakers is at least half way up.
Unplug the speaker from whatever hole it is plugged into and plug it firmly back in and test sound.
If still no sound other than some static on the speakers, try every single hole on the back of the computer that the jack will fit properly and test for sound.