Last night when my new/refurb Imac went into sleep mode I noticed that the room lights started flickering. At first I thought it was the bulbs going. So I went into another room and those lights were flickering too. So I went back and woke the Imac back up and the lights stopped flickering. I shut the computer off and I noticed the lights started to flicker. It was very faint but it was definitely there even though the Imac was off. Well I unplugged the unit and the lights stopped flickering. I plugged it back in but did not turn it on and the lights started to flicker again. So I just l left it unplugged for now. Now I dont notice the lights flickering when the Imac is actually up and running I dont notice the lights flickering, just in sleep mode and when it is off. Do I need a bigger/better power surge device? Am going to call Apple later on today when I get back home.