If I select sleep from the apple menue on my iMac, the comupter goes to sleep, fan dies down and the light begins to pulse....however if I let the computer go to sleep itself, the screen will go off and it seems like it's in a sleep state, but there is no pulsing light and the fan is on like normal operation...I've tried to use a different setting, turning off putting the display to sleep seperately, checking and unchecking put hard drive to sleep...nothing.
Any ideas?