27" I7 imac high pitch noise, common?

[existe]

I have a new 27" I7 that appears to have the high pitch sound issue if the brightness is not at max or lowest. How "common" is this issue?

I do not need the perfect iMac (I have some gray banding and the 1TB HD grumbling and it is not a big issue to me) I just wanted to see if this high pitch noise is considered a defect and needs to be fixed/replaced or it is more common than not with the iMac.

Also read that the grounding plug might have something to do with the noise and that buying a hum reducing device might solve the issue. Thanks

 

[Btom]

It is unstable power supply issue, endemic for the 21.5"/27" iMacs. It may affect reliability of the PS (not to mention annoy you). Return/replace unit while you still can IMHO.

Tom B.

 

[existe]

Called Apple Care and the advisor stated he has never heard of this issue but he did state he could hear the high pitch noise through the phone. He advised I take it back and exchange. road trip time I guess.

 

[munckee]

Crap. I just got my 21.5" yesterday and it has the same issue. Guess it'll be going back as well.

 

[Felias]

It seems around 70% of all iMacs have this issue more or less... Most people don't know what to look for, and it's not loud enough to hear it right away in a lot of cases.

I personally never have seen an iMac since late 2009 that does not have this issue...

 

[munckee]

It seems around 70% of all iMacs have this issue more or less... Most people don't know what to look for, and it's not loud enough to hear it right away in a lot of cases.

I personally never have seen an iMac since late 2009 that does not have this issue...

Mine was quite noticeable. I debated ignoring it, but I'm going to exchange it and see what I get back.