原帖由： Kevin ,
There seems to be two faults discussed here - (1) noise and (2) Combined Noise and overheating. I have (2) noise/overheating version. A big concern, as it’s likely to be an overloaded power supply, that could fail. My Mac is connected to a second monitor, but that should not contribute to the problem, as it only uses signal, not power. Since aiming a desk fan at the iMac vent, with a cardboard funnel focussing the air at the vent, the noise and heat went away. I already had a UPS / line filter in place and that made no difference.