[kent m]

Mac OS X 10.6.2

Symptom

After the computer wakes from sleep there may be no sound. Visual feedback indicates the volume changes when the volume keys on the keyboard are pressed but the sound does not work. Applications that should produce sound do not. This happens maybe every second time the computer wakes from sleep. Putting the computer back to sleep and RE-waking fixes the problem.

I made a quick search in the history, didn't see anything helpful... no articles match on the apple forums other than this one: Mac OS X: Loss of Sound After Waking From Sleep which isn't relevant.

Any help appreciated. This post has been presented in Hardware AND System as I'm not sure which its relative to. Mods please delete or approve as appropriate.

Thanks
Kent

[reader50]

Namely, what Mac is it, what peripherals, any expansion cards, etc. Presumably an Intel Mac based on the 10.6.2 part. What happened around the time the problem began - did you upgrade anything or install something new?

Originally Posted by kent m 

Putting the computer and RE-waking fixes the problem.

That is one durable Mac, if the golf club doesn't do any damage.

[kent m]

Ha ha, nice image. Point made, though I might have used this one:

:-)

But yeah -

Model Name: Mac Pro
Model Identifier: MacPro4,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.26 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per core): 256 KB
L3 Cache (per processor): 8 MB
Memory: 6 GB
Processor Interconnect Speed: 5.86 GT/s
Boot ROM Version: MP41.0081.B07
SMC Version (system): 1.39f5
SMC Version (processor tray): 1.39f5

ATI Radeon HD 4870
-

Firewire,
old iSight cam

usb:
epson printer

-

Near as I can recall its always done this.

[reader50]

Try unplugging the iSight, since those do have sound. Just sound input, but what the heck. Leave it out while doing other tests, so as to have one less variable in play. You could unplug the printer too, but I don't see how a printer would affect sound.

Vacuum the audio ports on front and back, including the optical audio ports. Plug / unplug a 1/8" plug into the sound-out port on back, and then the headphone jack on front. Vacuum again, and plug / unplug again. Dust contaminating either jack will disable normal sound, since plugging something into either is supposed to disable the internal speaker.

I'm assuming you are using the internal speaker, and do not have an external sound solution.

[kent m]

Thanks for the tips. I hadn't thought about disconnecting peripherals, just assumed it was a software thing...

and I've just upgraded to the latest and it seems there hasn't been a reoccurrence... we'll see... and I'll do that cleaning.