No sound after sleep

Which mac os do you have? try to contact customer support in you r still in warrenty.

I have a new Haswell 2013 13" rMBP, yeah Im from the UK but I'm in Spain for the next 2 months so I'm waiting till I'm back home then taking it into my local Apple Store for a session with the Genius Bar as I'm also having problems with laptop periodically crashing when in a long sleep and basically not being able to wake up at all (requiring a hard shutdown).

Having the same problem. External speakers will work, but not the speakers on my MBP. I tried the Activity Monitor force quit of Core Audio and it worked, but it has not worked again.

I am also having the problem that Supreem is having, of my MBP "periodically crashing when in a long sleep and basically not being able to wake up at all (requiring a hard shutdown)."

Not sure if the sleep and sound are conected though...

I also do not have those pref files, or at least cannot find them...

I assume yours is a 2011 model from the info given, can I ask did you have these issues prior to updating to Mavericks or only after the update?

Yes, it is a 2011 and no, I did not have either of these issuses before I decided to ride the big waves at Mavericks...

Thanks for the reply, that's interesting to know. I'd love to be able to put Mountain Lion on my Late 2013 rMBP and see just what happens!

I just did the step you mentioned. Waiting for the mac to sleep and test! Will update later on this.

@SukhiAatma: you can press power button to go to sleep mode to test. I tested many time it is definitely fixed in my Mac.

Look in your "main" library. There are two libraries, one in your user folder and the other library is in the main "Macintosh HD" folder which should be its partition name. If you use the Mac library and go to preference folder you should see another folder inside with the "audio" name. So who said Macs are not confusing?

I will keep my fingers crossed and see if this works. My sound faillures have been infrequent sometimes taking more than a day to reappear.

Thanks for trying, but I do not have that folder in my main library prefs, or my user library...

I am having this same issue with my brand new Mac Book Pro. No sound unless I restart. Just talked to Apple and they had me create another user name and see if it happens with that one. He acted like he had never heard of this problem. I wasn't happy with waiting an hour and 1/2 to see if it's going to happen then calling back. It will happen .

Dr Prem's Apple Care solution was not a cure for my new MacBook Pro Retina nor do I think the recommendation to create a new user name or even splitting your hard drive into two boot partitions and installing Mavericks on both to compare will solve the problem. I'm sure this is a problem that Apple must now be aware of from the number of posts here. Hopefully it is a software bug that will be fixed in the next update. Just one man's opinion. I am fortunate that I can wake the computer from sleep sometimes a dozen times before the problem rears its ugly head again. I have not tried creating an additional partition and installing an additional plain vanilla Mavericks OS to see what happens. I consider it a waste of time but if someone else wants to try ... maybe it might work but then what would be the problem with my original OS setup?

This is definitely not hardware issue. I bought my mac book pro december 2013, in Canada. I experienced the no sound after sleep issue last week. I did which i mentined earlier and it solved my issue since then I didn't experince it again. I test it many times and the problem in my mac book pro is fixed permanently. I didn't get why you guys still have problem. make sure you delete those two .plist files in root library/preferences/audio in safe mode. you guys might have problem to find the exact filder and file.

I have an Apple developer account and submitted a bug report to the Apple engineers about this issue. I got a message back indicating that this was an issue they were already aware of. Hopefully the next Mavericks update will resolve this issue.

In the meantime, if you go to Energy Saver in System Preferences and check off "Prevent computer for sleeping automatically when the display is off" you should be able to walk away from your computer without losing sound. It worked for me. It's not a fix and it will drain more power/battery life, but it does allow you to walk away from your computer and not have to reboot everytime. Hope this helps.

In reply to Dr Prem: I did exactly what your message said to do. I booted to safe mode and went to the root library preference folder and found my audio folder. After deleting both audio preference files I restarted my laptop and had to wait less then a day before the problem came back. I don't know how frequent the audio problem occurs with others. Mine only occurs occasionally, somtimes only after many sleeping sessions over a couple of days. After your Apple Care solution it only took a couple of sleep sessions for the problem to come back again. I'm sure that was probably just a coincidence since there doesn't appear to be any standard frequency or tasks that seem to make the problem occur. I've put my new MacBook Pro to sleep five times today and have not experienced the audio issue yet. Perhaps it will happen tommorrow but it will certainly reoccur sooner or later. Has anyone had the problem occur everytime their new MacBook Pro wakes from sleep? That hasn't been my experience.