I'd venture to say this is due to the caps controlling the on/off switch. I have noticed that my IIci (before recapping) doesn't respond to the power switch at all. It doesn't spontaneously turn off, but it remains on all the time and can't be switched off without unplugging it. I noticed several bad caps right in the vicinity of the power pushbutton on the rear of the logic board. I've removed all the caps and am waiting on a new set from trag. I'll try and remember to post if this fixes the power issue for me.