Noise Bright Imac 27"

I have an Imac 27" and when I down the bright appears a noise, like a cricket.
Do you have this problem?
I call apple and they say me that isnt normal and offer me a change, what did you think?

So, when you turn down the brightness, you are hearing a humming or scratching sound? And does it go away as your turn up the brightness?
Without hearing or seeing the issue, my first reaction would be to say you are hearing some amount of electrical noise, perhaps from the inverter board itself. But, it could be many things. I'd be inclined to take it into an Apple Store for verification if that is possible. Otherwise, if you're within your return policy and it sounds abnormal to you, there's no reason not to let them do a replacement for you.

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  • Buzzing Noise from (IMAC 27-INCH,MID 2010)

    I have noticed this buzzing noise (like crackling electricity of sorts) comign from the left side of the machine out of  the cooling vent.  I bought my IMAC in 2010 and have not had any problems with it until now.  I noticed the "noise" a couple of months back and it would show up here and there every once in a while, it was not annoying, so I let it be.  Until this last time, when the noise was loud and annoying, I could not just forget about it.  I am under warranty and called into Apple to see what can be done for this problem.  I was told to take it into my nearest Apple store to get it looked at, since over the phone they could not do anything about it. 
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    This might seem a strange answer, but it has fixed this fault on my 27" two year old iMac (at least for a few days now, will be monitoring).
    I had this very fault suddenly develop last week.   It was consistent, the noise increased with screen brightness, but was also present with the screen asleep.
    I looked at every forum on the subject, became almost convinced my fans weren't controlling properly as well.
    I decided it was the switched mode power supply, discussed repair options with my local Apple Store.
    Checked the household mains voltage - I'm in the UK, it was slightly low at 236v AC, but thats acceptable.
    Then ....
    We have a garden full of water features and LED lighting.
    I just decided to check all our power junction boxes that supply power to various pumps and lighting.
    I found one of the boxes full of water, with the Live, Neutral and Earth, and the 12v DC cables all under water and shorted together.   The terminals were all corroded and burnt.
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    I repaired the box, fitted new terminals and rewired the box.
    And since I did that, my Mac has cured itself.
    I've had it running for hours to get hot, no noise, gone completely.
    And the mains voltage now measures 242v AC (should be a nominal 240).
    The RCD did not trip because, with all the cables shorted in water, there would no out of balance condition to initiate a trip.
    So, I can only assume that arcing or the short was causing some harmonics on our mains supply that was been picked up by the coils in the Mac power supply.
    The 12v DC supply in the junction box was also supplied by a switched mode supply.   I dont understand why something didnt blow in the garden, but it didnt.
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    Oh, and I noticed our Intruder Alarm panel was humming loudly and now it isn't.
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    Even any loose mains plugs in equiment could be causing a slight arcing on the contacts, causing noise on the mains that may be getting picked up.
    Coming from an interest in high-end analogue Hi-Fi, amplifiers always performed better with a dedicated, clean, mains supply, usually from a 40 amp rated cable fed direct from your electricity meter to supply your Hi-Fi.
    The amplifiers would exhibit less noise and a cleaner sound with more detail.   And the transformers in the power supply were a lot quieter too.
    And what do we have today - ethernet tranducers plugged into household sockets, superimposing high frequency signals onto the household wiring.
    They would cause havoc with top-end amplifiers, I'm sure.
    I hope this is the solution, saves me an expensive repair.
    I've never had any problems with the six Macs I've owned in the last 12 years.

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  • What is the noise my iMac does while using boot camp?

    Hello.
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  • Hello,  ventilator noise in imac  bouth 15 days ago aafter instal mavericks, whats happen!!!!!

    Hello  , apple  peopla, i want to know, whta happen, whityour products, I bouht  a imac  21,5" inches   15  days  ago, and  this is  go wrong.  , I am starting de mac  , and de ventilators begin generate noises. a think taht  is  happen, after intalling  maveriks update, please help me, or give me  a solution , im user imac for 15 years, and never  happen it to me  whit other imac models, , I spend  $2.300.000 pesos colombianos, for  the best machine but i very very bored, . whit this problem, please helpme .
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    I bouht  a imac  21,5" inches   15  days  ago,
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    You have 90 days of FREE phone tech support on top of your standard 1 year warranty unless you also purchased AppleCare which gives you an additional 2 years of coverage plus FREE phone support.
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    You missed the finger gymnastics.  Follow the directions in KB Article:  http://support.apple.com/kb/HT1379 Resetting your Mac's PRAM and NVRAM 

  • Strange noise in iMac 24 (White)

    For a month, my iMac, sometimes, makes a strange noise like birds singings, it sounds in the right down corner of the iMac. I recorded the sound:
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    Sorry for my bad english -.-
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    Muchas gracias/Thankss ! ^^
    Greetings

    Más cosas... Se trata de los ventiladores. Quizá les falte aceite !
    http://www.macbetagroup.com/?p=18
    Por cierto, te puedes descargar la aplicación freeware SMC Fan Control, con la que podrás regular la velocidad de los tres ventiladores que tiene el iMac Intel Core Duo. De esta manera también desaparecen los ruidos que mencionas.
    http://homepage.mac.com/holtmann/eidac/software/software.html
    More news... The noise comes from the fans. Maybe they need oil !
    http://www.macbetagroup.com/?p=18
    By the way, you can download the freeware app SMC Fan Control. It will allow you fan speed control of your iMac Intel Core Duo. It's also a way to make disappear these chirping noises.
    http://homepage.mac.com/holtmann/eidac/software/software.html

  • Buzzing noise in iMac(2013) when running on UPS.

    Hello,
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  • Can anyone identify this noise my iMac is making?

    file:///Users/rockcrusher01/Desktop/iMac%20Noise.mp4

    You need to upload your file to youtube or some file sharing site so that people here can access it. Does the sound stop when you reduce the computer volume level ?.

  • Popping noise on iMac core 20" anyone?

    Hi
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    Well to be honest the manager did try and get out of refunding at first. This is what happened at PC WORLD
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    "not acceptable" I said
    "I'm very sorry but none of our stores have any in stock at the moment, but we can deliver one" He said
    "I don't think so - whats my other options" I said
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    "no sir sorry" He said
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  • I hear a soft POP noise and iMac dies - help?

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    Greg Kirkpatrick-
    Could be power supply related.
    Check to see if you are covered under one of these repair extension programs.
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