I have a 15 year old MacIIci that still works (for the most part). Unfortunately, we have power failures & electrical problems in storms. I think my mac has turned off the display (put it to sleep) as a result of a power glitch during a recent storm. It has happened once before, and there is a certain key combination used during reboot to turn it back on, but I don't know what it is. It will reboot & plays a short musical interlude when it starts the reboot, but the screen stays blank. Can anyone help? Thanks.