21.5'' iMac - Screen Noise

My 27" is dead silent regardless of brightness setting. Purchased in Sweden.

I have a yellow tint on my screen and will try to get my machine replaced. I hope I won't get a buzzing one because noise is much worse than the tint.

/ j

Yellow tint? Try following, go to display settings and color profile, change to RGB.

Apple told me they are working on a firmware update now. They suggested changing reseller again to try to get a working one in case I don't wanna wait...I've already spend around 4 hours on the phone or in shops to solve this problem, it's not really an Apple-experience this time.

Vel1303: Half the screen is yellow tinted and the other half is ok. This appears to be as common fault as the noise.

derbystar.
What week was your imac made in? To find this, check your serial number (click on about this mac, and then click on 'version' twice). The week it is made is the fourth and fifth number of the serial number. My replacement is from the 43rd week and still squeals. I am glad to hear you got a good one - and that brings hope to the rest of us!

derbystar16, maybe they were using old parts one week and got new ones the next. Anyway, I am hoping that I can eventually get a new one that is quiet. I think that I will stick with mine for a month or so and then bring it back. Hopefully the issue will have been addressed by apple by then and there will be no more squealing imacs. I have applecare and should have no issue getting it replaced, again!

Yup, I have this same problem with my 21.5 inch. Right away it reminded me of that sound some old TVs make when they are turned off. (of course my biggest pet-peeve sound)

I am REALLY hoping that an update of some sort can fix this as I can't really afford to send my mac away for a week or more.

I am at work so after I am going to play around with brightness and try the Shades thing.

I downloaded Shades and started the application. I put my brightness all the way up and the dog whistle has stopped! thanks for the help.

However, I hope Apple can create a fix for this so I don't have to run this app forever.

jajo.j: is it the right side of the screen that is more yellow? I notice some color shift with mine where when I'm looking at it on-center, things towards the right appear warmer or more yellow at times. However, if I move my head so I'm looking head on at that side, it looks normal - as if it is a slight shift of color from an angle. I did lots of shifting of my head back and forth... I'll have to compare to one in the store now to see if that's how they all are.

It sounds like yours is more severe though.

after finding massive backlight leakage on the 3rd replacement i received i decided to take it back! The new one still has the high pitched noise. This is week 38. The apple store was supposed to call me back, but they havent. I think i might go back to a pc.

I have a brand new, fresh from Apple, 21.5-inch iMac. And guess what, it makes as high-pitched whistle noise! It's only at the top three brightness settings, and the sound is very quiet and VERY high pitched. The noise gets higher in pitch, the brighter you set the screen.

You definitely wouldn't be able to hear this noise in an Apple Store, because there's too much ambient noise there. And you definitely won't be able to hear this noise if you're of a certain age, because it's the kind of frequency that only younger ears can pick up on.

So what do I do? I really don't want to return this iMac. It's brand new. Is this something that Apple can fix via a software update? Perhaps ALL of the new iMacs do this, and they will ALL be fixed via a software update?

I don't think it disappears, it probably is at a frequency too high for your ears to pick up. I can hear it still, just not as annoying.