No sound out after wake up in Mavericks

I would do as you suggest if I understood what you're saying about a PRAM reset.

Could you explain? Thanks!

Same issue with my 2013 macbook air. PRAM reset DID NOT WORK.

you first have to search and delete these files:

• /Library/Preferences/com.apple.soundpref.plist
• ~/Library/Preferences/com.apple.soundpref.plist
• /Library/Preferences/Audio/com.apple.audio.DeviceSettings.plist
• /Library/Preferences/Audio/com.apple.audio.SystemSettings.plist

and then:

1. Shut down your Mac.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.

This does not work (at least for me)

Caveat Emptor!

To anyone thinking about testing out derolli's suggestion, as I mentioned in a previous comment, resetting the PRAM completely wiped my mid-2013 MacBook Air.

I'm a long time power mac user.

This stuff is not new to me.

Clearly, there are issues going on with Mavericks.

To prove my point: now... the "no audio" problem is intermittent. Sometimes there's no audio after sleep... sometimes the audio just picks right back up where it left off.

All I'm saying is that you can't expect Mavericks to behave consistently and I would definitely recommend using Time Machine. It's the only thing that saved my ... well ... you know 🙂.

Good Luck.

Also having the same issue on a brand new (late 2013) MacBook Pro 13" retina with 10.9. No sound sometimes after waking up. Very annoying and only a restart fixes it. I see lines like this in the console, but not sure if this is related

11/1/13 9:17:03.000 AM kernel[0]: Sound assertion in AppleHDAFunctionGroup_10134208 at line 531

11/1/13 9:17:03.000 AM kernel[0]: Sound assertion in AppleHDAFunctionGroup_10134208 at line 531

11/1/13 9:17:03.000 AM kernel[0]: Sound assertion in AppleHDAFunctionGroup_10134208 at line 531

11/1/13 9:21:49.000 AM kernel[0]: Sound assertion in AppleHDAWidget_10134208 at line 741

11/1/13 9:21:49.000 AM kernel[0]: Sound assertion in AppleHDAWidget at line 4332

11/1/13 9:21:49.000 AM kernel[0]: Sound assertion in AppleHDAEngine at line 1999

Also I just noticed that when this issue occurs the Sound preference panel does not change when I plug in my headphones. Usually the Output device will change from 'Internal Speakers' to 'Headphones', but when the issue occurs it stays stuck on 'Internal Speakers'.

I found one solution that works for me.... I always have my headphones connected to the laptop. If I disconnect them from the laptop before putting it to sleep and then I connect them again after laptop is on again, I have no issues... Not the best solution, but works...

I was begining to spot that, just have not done it enough to be sure.

I also have a run away kernel_task issue that I have is feeling linked to this as well.

https://discussions.apple.com/thread/5497235?answerId=23621110022#23621110022

I had this problem (sound from iTunes) - turns it was sending it out through airplay. set to comuter (in iTunes) fixed it!

Having exactly the same issue on a new MacBook Air 2013, and the only measure to bring back sound is to restart the system, which is obviously very frustrating, if you're doing it multiple times per day.

I've found that the audio is ok with the headphones plugged in but is 'greyed out' when removed. I've tried all the trouble-shooting steps in this thread: https://discussions.apple.com/thread/5478554?answerId=23514960022#23514960022 but had no luck.

One thing i'v noticed is that the Sound defaults to the Optical digital-out port as opposed to the speakers in System Preferences: Sound.

For me, restarting doesn't even work to reset the sound :-(

Same issue, very annoying.

same issue here 4 days without sound...apple whats happened?

Same issue. Intermittent now. Very frustrating. 😟