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Original post by: Kevin ,

Text:

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.

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open