Doubts about Hibernation Mode in imac

Hi!
I have some doubts about hibernation modes in my imac.
Some times the hibernation led pulses, sometimes just stays on.
Can anyone explain if there are any diference between this two hibernation modes?
Thanks a lot.
Vidal

If it is in hibernation, it should pulse. If the machine has got to the point where the screen has turned off but the computer has not gone to sleep yet, the light will not pulse. Check your energy saver settings in your system preferences.
Some applications can prevent a proper hibernation and while the screen will turn black, the system will not sleep properly and the light will not pulse.
Karn.

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