Current noise and fan problem

[Beluga1000]

1.I heart some current noise when I put my ear near my iMac, is that normal?
2.I can see my fan is spinning when I turned my iMac on, the temperature should be but I don’t understand why the fan is spinning.

 

[chabig]

Yes. It's normal. You may hear other sounds too.

 

[Apple Knowledge Navigator]

iMac has one fan in the base model, two in the others.

 

[DeltaMac]

What type of noise is "current" noise?
I don't think I have heard a noise that I might describe as "current" noise.

 

[Beluga1000]

What type of noise is "current" noise?
I don't think I have heard a noise that I might describe as "current" noise.

Ah something like electric flow sound it’s not too loud, I can only hear that when my room is completely silence.

 

[chabig]

Stop obsessing.

Fan speed problem

I can see the fan is spinning slowly when my iMac isn’t doing any heave load stuff, is it normal?

forums.macrumors.com

 

[EvilMonk]

If you watch a video on YouTube and hear sound it might be coming from the speakers though… ??

 

[chabig]

But it’s hard to watch YouTube when you’re blinded by the glare from the micro scratches. ?

 

[DeltaMac]

"electric flow" is also not an identifiable sound (just my opinion there)
Maybe it is actually "coil whine" --- or "static" or hum from the speakers

 

[EvilMonk]

Yeah coil whine is a common problem with some hardware (like my sonnet RX 560 TB3 egpu) the OP might want to google his model identifier to see if the problem is common

 

[Beluga1000]

If you watch a video on YouTube and hear sound it might be coming from the speakers though… ??

No, it’s muted.