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Member Since: Nov 16, 2006
Location: UK, London
Posts: 637
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Mac Specs: 13 inch Macbook Pro Retina, 2.7ghz, 128gb SSD

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This happened to me as well a few months ago, all of a sudden my macbook would not go into safe sleep mode.

I entered this terminal command to enable it again:

sudo pmset -a hibernatemode 3

I'm not sure why safe sleep was disabled but it did, I entered that terminal command and it worked after that.

Note: you may have to restart your mac for the changes to take effect.

Vikram Shah
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