Is there a quick fix to the external speaker port not working on a new Aspire?

By default Windows does route sound to the internal speaker,  however you may check the sound settings.

Press Windows key + X ,   click on "Control Panel",  

With the Control Panel in "Control Panel Home" view please click on "Hardware and Sound"
Where it says "Sound" in green letters there are three options below that are in blue click on "Manage Audio Devices",  This will bring up a window labeled "Sound"
On the "Playback" tab there is listed the sound options available to you. One should read "Speakers" Click on that.
There should now be a check mark on that option, make Speaker output as default . The Sound should then play through your Speker.

 

 

If the issue persist, first uninstall the Realtek high definition audio under "Sound, video and game controllers" in device manager

Then restore the Realtek driver from Acer eRecovery management.

Use the following steps to reinstall a driver or application on your computer:

Press the Windows  key to open the Start screen, Type Recovery in the search box.

Click Acer Recovery Management in the search results, Click Reinstall Drivers.

On the Contents tab, locate the Realtek driver you wish to install and click the Install icon.
Follow the prompts to install the driver.

"Hit accept if its helpful"