I had the same problem, especially when my Mac would wake up.  It turned out 
that we had added a defective memory stick.

On Aug 3, 2011, at 12:38 PM, james walton wrote:

> hi,
> 
> anyone having a problem where,
> your mac will freeze if left on for a period of time.
> no sound no voiceover? no nothing?
> i hope someone can help me figure this one out.
> thanks.
> 
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