The imac is now a vintage computer ......... In fact, in the Apple ll era, this problem already exists; but because the apple computer at that time is mostly plastic chassis, plastic chassis does not leakage, so the problem is not big. General computer chassis (including audio-visual equipment), the design will be "grounded"; "grounding" means connecting the metal chassis. In order to avoid leakage of electricity from the metal chassis, usually a wire will be installed in the chassis to connect to the power supply, so that the static electricity will be taken away by the "water line" of the plug-in; for example, a dvd player which does not have a power supply will have a wire connecting to the chassis in the plug-in. If you can't find the "water line" in the imac's power supple, you can connect the case directly to the household water hose or glass window frame. In addition, apply ll era, those power cables may only have two pins, that is, no left "water line" pin, that is, can't take away the static electricity; you need to install a conductive wire in the case to go to the water pipe, to dissipate the static electricity.
You can go to the gold store to spend more than ten dollars, buy a [ he pen ] correctly called test pen, with a word contact metal chassis shell, with a finger to hold down the other end of the pen he garden head, if the leakage of electricity, it will be with a red light.
It doesn't matter if it damages your computer, it damages your brain, so send it in for inspection or return it for replacement!