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Optiplex 960 Sleep Mode

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I have a Dell Optiplex 960 running ML 10.8.5.  


The machine will sleep on its own, or I can put it to sleep - but it will not recover on its own.  I have to force a restart.


Where do I begin?  


BIOS sleep setting is set to S3 - is that of any value? 


Thanks in advance.



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You need a modified DSDT (mandatory) and SSDT (optional) to wake from sleep, I own one of these, but dont remember the source I got the DSDT from, just check google. Search DSDT Insertoyurmodel here

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