Audio out problem

Hey guys,
The audio on my Macbook is acting up. It only works when something is plugged into the audio out/headphone port (basically the onboard speakers won't work). When I press the mute key (F3) it just continually shows the audio icon with the bar at the bottom empty. If I look inside the headphone port, theres a red light shining.
Any help?
Cheers
Joe

You have a hardware issue that needs to be addressed. Either take it in for service or call Apple and have them pick it up via FedEx.
-Bmer
Mac Owners Support Group
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Why doesn't the Belkin Thunderbolt Express Dock relay sound from it's audio out port?

Posted to Belkin Support community to no avail
=====================
Why can't my Belkin Thunderbolt Express Dock operate my desktop speakers?
Options
07-14-2014 01:48 PM
Bought a Belkin Thunderbolt Express Dock at the Apple Store to use with my new MacBook Pro.
When I connected it to my
-20" Mac Cinema display,
-Various USB connected hubs and devices,
-Various Firewire hubs and devices
-My ethernet network from my Cable Modem
Then made the last connection from the Dock to the Thunderbolt port on the MacBook Pro...
All was fine.
But when I made that one last connection - to my desktop speakers via the audio-out port on the dock (earphones icon) nothing happened. The dock did not pick up the audio from the laptop playng an iTunes song or send it to the desktop speakers. When I unplugged the audio cable from the Dock and plugged it in to the MacBook Pro directly, the desktop speakers kicked right in again.
Does Thunderbolt pick up audio-out from a MacBook Pro and carry it to the Dock for connection to my desktop speakers?
Of for some reason, can that signal not be carried by Thunderbolt?
Will I have to get used to the onerous task of unplugging 2 cables from my MacBook Pro when I want to more it to another location in stead of just 1 cable?
But stay with me. Here's the thing.
When this happened I called Belkin Customer Support to ask if they could help me. After taking me through their steps, they agreed that the unit must be defective and agreed to ship me a replacement Thunderbolt Express Dock.
The replacement arrived over the weekend and when I shut down my system and then plugged everything from Dock I purchased into the replacement Thunderbird Express Dock - - - - - the same thing happened!
No signal to the speakers from the dock. Perfect signal when the plug moved from the Dock to the computer itself.
Hence my question:
Does Thunderbolt pick up audio-out from a MacBook Pro and carry it to the Dock for connection to my desktop speakers?
Can it accomplish that function?
Am I really that unlucky to have received 2 defective new Belkin Thunderbolt Express Docks in a row?
Or is it simply a matter of the Dock not handling audio throughput in the manner I am expecting.
Then again, if this is the case, why did the Belkin techies not know this when I called them in the first place.
Yes, I'm going on and on here. But I really don't have time for this.
What's going on here?

OK. No reason to be playing games here. Just surprised that this issue hasn't been brought up here on the community boards as well. Here's the simple solution
Steve
========================================
Re: Why can't my Belkin Thunderbolt Express Dock operate my desktop speakers?
Options
07-17-2014 07:09 PM
After reaching a Level III technician in Belkin customer support today and having spent approximately 4-5 person hours on this issue, we figured out that the Sound/Output preferences in the Apple System Preferences should not be set to "Internal Speakers" but rather set to "USB PnP Sound Device".
Worked like a charm. Simple, elegant solution to a real problem, one likely to be encountered by 90% of the people who buy a Belkin Thunderbid Express Dock off the shelves of any Apple Store to use with a current generation Apple laptop or desktop computer.
But the Level III Belkin technician admmtted that this critical little piece of simple, straightforward information should have been readily available to their Level 1 techies who began helping me 5 person hours ago. Would even have saved Balkin loads of customer service support time.
And so the saga ends
Belkin owes me for helping them learn this precious lesson.
Steve

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In the FAQ of the Airtunes, Apple mentioned to use lower security, as some Computers probably do not have enough power to stream music flawlessly. But my Computers really do have enough power! I think the AX does not have enough power to do that. So I created another wireless network with one of my AX. I set the security to WEP-40bit key and joined this new Network with my other AX. Not the best solution, as I'm now connected to the Internet or to the AX to use Airtunes. Cables could fix that problem, but then I could use a wired system instead...
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Thanks, I hope I can help others with this annoying problem...
Sorry, I forgot to write about the RF Interference. Belive me, I spent hours and hours searching for a solution in the Internet and every checkbox the Admin utility offered me to try out... I'm working as a system engineer, and supporting computer systems since the early 90ties, so I'd say I have a bit knowledge about all the networking, WLAN, Audio... In school we had the Apple Mac I with the 12" monochrome monitor and appletalk for networking quite funny!
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