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Old Jan 4, 2013, 11:01 PM   #1
rittchard
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Late 2012 iMac - clicking/static sound?

Has anyone else noticed a really subtle/light clicking or static-type of sound coming from their iMac? I've pretty much ruled out everything (external drives, speakers, etc) but the unit itself. It's not really that loud, but if there are no other sounds I'll hear it occasionally and it is kind of bothersome.
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Old Jan 4, 2013, 11:24 PM   #2
nagareru
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Yes I hear it too, I have no idea what is it though. But it isnt as annoying as the sound i get when the street lights go on. They kind of pollute my power system and my imac starts to make this buzzing sound, it isnt really loud but it is loud enough to be annoying.. I cannot really blame apple coz it doesnt matter if i get a replacement, it will still make a noise because of my dirty power. From what I've read it is not really harmful for the computer, it is just annoying.

The sound comes from the bottom left of the computer right? Thats where the PSU is located.
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Old Jan 11, 2013, 06:32 PM   #3
shaine83
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Unhappy

I have the same annoying static sound, it alternates from the bottom left and sometimes right corners and is more noticeable when I put the display to sleep or wake up. I phoned apple and received a replacement only to get the exact same noise.
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Old Jan 19, 2013, 12:04 PM   #4
shiny-blanket
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I've had this on my original and replacement. Definitely caused by the display brightness change.
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Old Jan 19, 2013, 01:21 PM   #5
NVRENUF!
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Guy with street light problem I would ASAP get a UPS,
To filter the power and protect from surge and Brown outs ..

before something happens !!!

If you get a UPS this should stop this issue from happening .

I Can't imagine it's good for the computer
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Old Jan 19, 2013, 02:47 PM   #6
myuserid08
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I've got the same thing, probably something warming up - wouldn't worry about it.
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Old Jan 19, 2013, 04:43 PM   #7
AngelGuy7
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I have the same thing on my replacement. My original unit did not have this issue but was plagued by a yellow and unevenly lit screen.

I notice that it's more apparent when the screen brightness is low but it still happens when it's almost all the way up. I'm returning my replacement because of this and because the screen is also having an issue with image retention.

I wouldn't just accept it as normal. Considering that my original unit did not have this issue I'm pretty sure that it's not suppose to happen.
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Old Feb 2, 2013, 07:34 PM   #8
hemaphore
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same static issue

I just got a Late 2012 iMac, fully loaded, and have the same issue when the display brightness changes: Left-Right alternating static "ticks". i tried 3 different surge protectors and same issue happens with all 3.

very unnerving because i wonder if there are any components that are slowly getting damaged as a result? good thing i got applecare!
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Old Feb 2, 2013, 09:39 PM   #9
Apple Techs
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Quote:
Originally Posted by NVRENUF! View Post
Guy with street light problem I would ASAP get a UPS,
To filter the power and protect from surge and Brown outs ..

before something happens !!!

If you get a UPS this should stop this issue from happening .

I Can't imagine it's good for the computer
For real had a customer with a blown power supply in there 27" iMac because of that
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Old Feb 2, 2013, 09:50 PM   #10
large farva
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All the times I've heard people refer to a humming, static of buzzing sound, especially when they've ruled everything out, it winds up that they either had dirty power, or they were running a Back-UPS unit that wasn't compatible with Active PFC power suplies. With PFC power supplies, like the iMac has, you absolutely must run a Pure Sine Wave Back-UPS unit. Or else you'll get that humming. Also, most of the units, like the one I use, the CyberPower CP1350PFCLCD, have an AVR feature, that conditions, and regulates the power voltage without using the battery, which takes care of brownouts and such. You'd be surprised how much stuff can affect your home's power. In my house, if I turn on my laser printer or space heater in the same room, on my Back-UPS unit, I notice the input voltage drop quite a bit. Sometimes to the point where the Back-UPS unit would kick in for a second.
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Old Feb 2, 2013, 10:03 PM   #11
WilliamG
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Quote:
Originally Posted by large farva View Post
All the times I've heard people refer to a humming, static of buzzing sound, especially when they've ruled everything out, it winds up that they either had dirty power, or they were running a Back-UPS unit that wasn't compatible with Active PFC power suplies. With PFC power supplies, like the iMac has, you absolutely must run a Pure Sine Wave Back-UPS unit. Or else you'll get that humming. Also, most of the units, like the one I use, the CyberPower CP1350PFCLCD, have an AVR feature, that conditions, and regulates the power voltage without using the battery, which takes care of brownouts and such. You'd be surprised how much stuff can affect your home's power. In my house, if I turn on my laser printer or space heater in the same room, on my Back-UPS unit, I notice the input voltage drop quite a bit. Sometimes to the point where the Back-UPS unit would kick in for a second.
I'm not running a pure sine wave UPS and have never had an issue like this... I don't think you can blame the UPS in every case. Perhaps some cases, but you absolutely don't need a pure sine wave UPS.
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Old Mar 4, 2013, 06:20 AM   #12
dappleapple
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I have the same problem. Noticed it on my new 27inch imac (late 2012), sent it back and have same issue with the replacement. Not impressed for such an expensive computer
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Old May 6, 2013, 12:52 AM   #13
seh1975
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Has anyone noticed the ticking starts if you dim the screen down to about 4 bars or less? I have this same issue on my late 2012 model 27" with the 1tb fusion and if I brighten the screen the sound stops.

Discussed with AppleCare and they hadn't heard of this. Took it into the Apple shop and they cannot hear the issue when they dim the screen. They could only hear the fan and hard disk. They waited till the shop was closed then listened to it in a quiet room.

As I didn't notice the issue for about 3 months (can't remember if I must have had the screen brighter) I'm told multiple times they would want to repair first, however they can't hear the issue so told me to come and collect it.
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Old May 6, 2013, 05:01 AM   #14
eattherich
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As mentioned earlier in the other thread, I've not heard that strange static noise from the lower left corner for a few weeks now. I imagine it was, as someone mentioned, the tape holding the screen on and after x amount of use it's finally settled. Regardless of what it actually was, it's gone now!
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