I brought my US purchased iMac to Vietnam after checking out posts here and on Apple's user group. I have a late 2010 so it is dual voltage. It seemed to runs OK at first but I seem to be having stray voltage sometimes on my keyboard (Apple USB) and on the outer edges of the monitor case. It is slight as I can usually only feel it if the back of my hand touches these places. It is also more on the edges. All electricity in my home is 220/240 Type C which is two round receptacle holes with no ground. My iMac is plugged into a splitter/adapter which can accept the ground prong but I am sure it does not connect to ground as there is none. I can buy a voltage step-down transformer here but I don't know if that solves the problem unless it connects the ground line to the neutral. Also I have developed an impending HDD crash situation as confirmed by Disc Utility.app. The empirical evidence that made me check Disc Utility was slow read times and an increase in "beachballing" and momentary freeze-ups. I read elsewhere that stray voltage could cause HDD failure. Could my current problem be caused by stray voltage? If so, I want to solve the voltage situation before changing out the drive. Any help would be very much appreciated.