Would like to ask if your iMac is plugged-in to an AVR (Auto Voltage Regulator) with the Surge Protector (power strip) as well. There's a similar post, but it's not exclusive to my inquiry. http://www.philmug.ph/forum/showthread.php?t=40091 In that post, it says that Macs have mini-AVR built-in. I'd like to hear your set-up. Please mention brand / rating you are using for your AVR too?