I get this as well on my 2012 Mac Book Pro.
After verifying I have sound with the volume keys, I can press Command+f5 four 
times to revive VO.


On Feb 20, 2013, at 10:24 AM, Phil Halton <philh...@comcast.net> wrote:

> upon waking from sleep mode, often VO will not speak. I have to mess around 
> with the volume keys to get some system sounds going, then turn VO off and 
> back on a few times before it will finally come up talking. It takes about 
> two or three minutes to do all this and get VO talking again.
>  
> it doesn't happen consistently, but more often than not, VO will go silent 
> after sleep mode, or a prolonged period of computer inactivity.
>  
> Actually, it seems to be tied into system sounds, since I won't get any of 
> the thunking, beeping, quacking sounds that occur when you do something to 
> invoke a system sound, whether VO is turned on or not. So, maybe it's not a 
> VO problem but a system problem?
>  
> Any ideas suggestions or advice are welcome - it's getting a little annoying.
>  
> 
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