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원문 게시자: Jurgen ,

제목:

Noisy, but not fan related noise

텍스트:

This one has a constant hissy noise. At first I thought is was a bad fan, but after reving each of them up using Mac fan control, this background sound remains constant. Could it be the power supply? it comes on immediately with turning on the machine, and remains a constant ……

기기:

iMac Intel 21.5" EMC 2389

현황:

open