Mac Pros restarting instead of waking from sleep
Numerous users are reporting an issue where various Mac Pro models restart instead of waking from sleep. In other words, the user puts his Mac Pro to sleep, returns a few hours later and presses the space bar to wake the system only to witness the system restart.
One poster to Apple’s Discussion boards reporting the issue wrote:
“Occasionally, it reboots when being awakened after an overnight sleep. I have only Apple RAM in the Mac Pro. My Mac Pro is the ONLY thing on a dedicated 15 amp circuit and the Mac pro is connected to a new APC RS1500 UPS which can supply 865 watts. I have noticed that on waking up from sleep the UPS shows a maximum momentary draw of about 400 watts — well within the capacity of the RS1500 to supply. […] I should point out that this rebooting upon waking from sleep does not occur every time, but only occasionally. The machine always boots promptly and I never see any error messages either on screen or in the Console Log.”
A number of fixes have been suggested, but unfortunately, none appear to be permanent or universally successful.
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