Where is the source of buzzing noise?
I just bought a second hand iMac and it works well in the first several days. Then there is some buzzing noise (the frequency varies, but usually pretty high) when I run some computation scripts (100% CPU usage, the frequency of noise is high) and when I scroll the webpage(the frequency changes compared to doing nothings, but not as high as running scripts). The amplitude is not so high but it’s noticeable. I asked the seller and he claims he never heard that.
I doubt the source of the noise might be power supply or CPU. Since the noise is still there when I locked the screen as long as there is some tasks running. And, I also launched the iMac into Target mode, under which the noise still exists and the frequency increases. To exclude other assumptions, I also used a UPS for all above tests.
I searched the web and found many people had this same issue with various modes of iMac (from 2008-2017). But most of discussion didn’t lead to a proper result. So my question is how to locate the exact source of this noise? And would it cause some damages to the board if I keep ignoring it?
Here is a link to one sample of the noise when I was running some code,
Thanks in advance!
The iMac just let out a LOUD POP sound and really scared me…, in this quiet evening. There is no obvious smoke or smell and the iMac runs as usual. But I really doubt this is caused by a capacitor explosion in power supply. Just wonder could it be possible for the machine running with an exploded capacitor in power supply? Thanks!
Esta é uma boa pergunta?