External Speakers quit working with Yosemite

Speakers are Harmon Kardon Sound sticks and were working fine AFTER the install of Yosemite but just stopped working today. Checked Sound in Sound preferences and it is still set on internal speakers for output like always. I used the headphone jack to connect the speakers and it's been working fine for the last nearly 5 years. I've tried changing the settings, unplugged the external speakers and rebooted twice to no avail. Any suggestions?

Same problem - had to unplug external speakers to get them to work even if I selected line out on the sound preferences, Rebooting/sleeping would reset the speakers to the Apple monitor's speakers.
The terminal command in the last post here seems to solve the problem:
Audio/ Video not working after Yosemite update
I set the line out to the external speakers, ran the terminal command, and rebooted.
Upon restarting the external speakers were again the default audio output device. I hope this is persistent!

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External Speakers quit working with Yosemite

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