No boot up sound even? There is a rather lengthy thread about the internal speakers going away and how they were fixed here:

https://discussions.apple.com/thread/4277327?start=0&tstart=0

It includes everything from repeatedly plugging and unplugging the headphones, poking the headphone jack with a toothpick, resetting the SMC and one person even had their mainboard replaced (under warranty).

CB

On 9/6/13 11:02 AM, Maxwell Ivey wrote:
hello; no fancy audio software.  i wasn't even running vlc when it happened.  
and it doesn't come back when i restart the computer.  thanks, max
On Sep 6, 2013, at 9:16 AM, Chris Blouch wrote:

I don't believe you can uninstall your internal speakers. Are you running any 
extra sound stuff like audio hijack or soundflower? Does a restart bring 
everything back?

CB

On 9/6/13 8:15 AM, Maxwell Ivey wrote:
Hello group; last night my speakers stopped working.  I can still get sound 
through the headphones.  when i go  to system preferences under sound it 
doesn't give me the option of choosing internal speakers.  how can i find out 
if they are broken or simply uninstalled.  And if they are uninstalled how do i 
get them back? thanks, max

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