IMac :: Irritating Whistling From System / Stops Whistling At Max And Min Brightness
Oct 29, 2010
I just received my very first iMac two days ago & just noticed this horrendous whistling noise that reminds me of leaving a really loud concert. It coordinates with the display's brightness apparently (I looked it up before hand) & stops whistling at max brightness & min brightness. Anything in between = whistling.
How should I address this problem? Should I just go to the Apple store & have them replace my iMac? :/
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Mar 13, 2009
2.0ghz Alu Macbook a few days ago and everything works perfectly well, the thing is that after day one the magsafe started to emit a low pitched electrical whistling noise. It tends to be there a few minutes after booting into the OS and then it turns down to almost unhearable, but I experienced it returning after a few hours of use and then disappearing again. If I move close to the escape key I can hear a crackling noise emitting from the magsafe.I'm not trying to be overly nitpicky or anything but I read somewhere that if it's doing that it would be a faulty Mag-Safe board or something.
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Dec 20, 2010
I just got my 2.0ghz Alu Macbook a few days ago and everything works perfectly well, the thing is that after day one the magsafe started to emit a low pitched electrical whistling noise. It tends to be there a few minutes after booting into the OS and then it turns down to almost unhearable, but I experienced it returning after a few hours of use and then disappearing again. If I move close to the escape key I can hear a crackling noise emitting from the magsafe.I'm not trying to be overly nitpicky or anything but I read somewhere that if it's doing that it would be a faulty Mag-Safe board or something.
Does any one you guys know anything about this? I have the 14 days to return it as I bought it online from the Apple Store so if it's a faulty part that might die/break/ cause problems later I might have to.
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Aug 1, 2010
I went to Best Buy yesterday and they just got the new imacs in and had on display side by side. The 21.5 display was not as bright and vibrant as the 27 display. The apple and best buy guys could not tell me why the difference. The settings were checked and found to be the same for both machines. I was going to get the 21.5 but now not so sure. I definitely like the brighter 27 better. Is this normal? Why is the 27 brighter? Has anyone else noticed the difference?
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Nov 28, 2010
I have the 21" iMac and need to brighten the screen. How do I do this?
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Sep 29, 2009
(Electricity as in AC power.) I've been using the brightness controls (F keys) to turn off the screen at night and leave my computer running. I just assumed it uses less AC power that way and I'm saving some electricity but I don't know a lot about electricals to confirm my theory. Does anyone know?
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Apr 3, 2009
So Apple wanted to charge me $900 to change my broken LCD screen. I did the change myself for $86, a feat I am very proud of. Everything works great (the bezel's a bit loose and I did a little aesthetic damage to the hinge cover) but apart from that, the screen is 10x brighter than my old Rev B screen. The problem is this: I can't regulate brightness. Neither from in system preferences or from my keyboard. The monitor does, however, dim, and sleep. Is this a firmware issue? If so, how do I fix it? I would kinda' like to have control over screen brightness. After some use, this screen is really SUPER bright. I'd really like to get the brightness down to humane levels (it's shining out the back of the case where you normally don't see light).
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May 21, 2009
I really hope somebody can help me with this. I've had an iMac for several months now. Before that I had a PC. Very soon after I bought it I started to get pounding rock music in the background whenever I tried to listen to anything. It's loud enough to overwhelm whatever it is I'm trying to hear. It isn't going all the time, but something seems to start it, and then it goes for days. I must have downloaded it accidentally when I was blundering around in the first month or os. If it was a PC I'd be able to find it, but Mac is still a mystery to me. I seem to remember that I downloaded something to do with a waterfall, "Dakota Falls" perhaps. The video was a waterfall which sat on the desktop. It looked quite pretty, but when I got rid of it the music wouldn't go away. So right now i can't listen t anything on my new iMac, and obviously I can't watch movie's or anything. It's really frustrating. The OS is Leopard. Also can anyone suggest a decent book on Mac that isn't too superficial. I'm not totally certain of the connection between the waterfall video and the pounding music, but they seemed to occur.
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Aug 28, 2014
i had just made settings for my gmail in the mail app, it crashed. then i deleted the gmail account as not to use it. now it sops me from shuttingdown the system. saying first close your mail app then shutdown.
Info:
MacBook Pro, Other OS, os x 10.9.4
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Jul 26, 2009
Some free fonts that i have downloaded refuse to be saved as PDF's due to copy protection issues. When downloading new fonts I now look for info on this, but I have downloaded many before and some are annoyingly PDF resistant ! Can I disable all fonts that are copy protected in one go so they won't appear in the Font Toolbar? or alternatively, can I disable the copy protection segment of font? Fonts are for personal use but would like to print them off.
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Dec 4, 2008
I purchased a new iMac a month ago. Often, the keyboard just stops working and the computer has to be restarted for the keyboard to work again. Another problem: Unless I plug my printer in with a USB, the Mac does not pick it up. The printer is a fairly new HP Officejet J5780.
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Nov 16, 2008
I have a G5 iMac - 2.1 ghz, 20", 250gb hd and 3gb ram, but it has been having problems starting up and it is also going to sleep midway through a task or at random times totally unprompted.
It now almost never starts up first time (I keep the iMac mains power lead always connected and the mains electricity supply turned on at all times now)- sometimes I will get the 'Start-up Chime' and then the cooling fans start spinning very loudly and then after a few seconds the iMac stops the start-up routine, but often when I try to start-up I don't even get the 'Start-up Chime' and I have to leave it for some time before trying again.
I can also now only get the iMac to run as a Firewire Target Disc by starting up with the T key held down and then using an old G4 (400mhz) Powerbook Titanium as the screen/keyboard by using the iMac HD as the startup disc for the Powerbook but this is obviously just a temporary work around.
I have also tried backing up all my data, and reinstalling the Mac OS X onto the iMac but the iMac still will not start-up normal and I still have to use it just as a Firewire HD.
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Feb 3, 2009
Is there anyway way to fix this as it is irritating to have to quickly watch all the videos to see which ones they are.
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Feb 27, 2012
I have used Time Machine to backup my data on an external hard drive with ample space for the past year. However, for the past month or so when plug in my hard drive and try to back up my files using Time Machine, it completely freezes my computer, to the point where I need to hold down the power button for 10+ seconds and completely restart. At first I thought this might be due to not enough RAM, but discovered it does this even if all other programs are closed.
Info:
MacBook Pro, Mac OS X (10.6.5)
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Nov 15, 2010
The brightness goes up when you plug in your MBA, but then over time it just goes up and up. I honestly like my brightness pretty low (rarely more than half, typically at 3-5 notches), but it just keeps on going up and up. I almost never set it above half, but multiple times a day, I notice that it looks pretty high and it's at like 3/4 so I put it it down to about 1/3, but after a while, it's just up again.
Anyone else notice this? What is it, why does it do this? How can I fix it? I don't mind not having auto-brightness (even though I loved it), as long as my screen doesn't keep going up.
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Nov 22, 2009
On a day-to-day basis I run: Adobe PS, INDD, and AI, Microsoft Entourage, Firefox and iTunes. Just recently, after an upgrade to Leopard, I added Things and Simplify Media to the list.The problem that happens before (on Tiger) and now (on Leopard) is command+tab switching stops functioning and Expose hot corners and shortcuts stop working.
I'm pretty sure this isn't a Finder crash because before, on Tiger, I could quit+restart Firefox and everything would be back to normal. Almost as if some shortcut had causes the system to act differently or there was some app dissonance?
But now, with Leopard, nothing I quit will cause these two features to act properly until I do a restart. Both features (command+tab switching and expose) are very necessary for my work flow. I have checked SysPref to make sure keyboard shortcuts are default and Univeral Access to make sure assisted devices is turned off.
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Nov 26, 2010
I have a 27 iMac, and a 22 inch Viewsonic as the second monitor.
The second monitor is just not bright. I have used another monitor as a second monitor as well. Both are just not bright enough to suit me.
I have fiddled with the brightness controls, to no avail.
Is that a generic problem with second monitors?
They just don't get enough juice or something?
Would another brand monitor help?
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Mar 23, 2009
i got a question about adjusting the brightness level on iMac.
i adjust the brightness to lowest but each time i restart or turn the computer back on, the brightness level would set back to highest. Is that for all the imac? is there a way to set it?
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Apr 20, 2009
I have a new iMac 2009 - 24' - 2,93Ghz, running the latest OS.
When I start, the brightness is at maximum... I set it to minimum, only to find it at maximum again when I re-boot the computer ! I tried setting it via settings as well... it just dosent stick !
On the flip-side, the volume retains its last settings.
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Aug 7, 2009
Am I the only one having this bug? I have a 2009 24" iMac Radeon 4850 and after installing the 10.5.8 combo every time the machine boots the brightness is set to maximum.
I tried zapping the PRAM and that didn't help.
The other problem I noticed is that my startup network shares, even though checked to "hide" pop up finder windows at boot time. It never did this before (even without hide being checked).
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Mar 11, 2009
the monitor's default brightness setting is far too bright for my eyes, so the first thing I did was to open the System Preferences pane and reduce the brightness setting. That worked fine until I shut the computer down. On rebooting, the brightness returned to its default highest setting. On my older iMac G5, the brightness setting always stayed put. It isn't a huge problem since adjusting the brightness setting does work, but I don't want to have to adjust it every time I reboot my computer.
I spent two hours yesterday on the phone with Apple support trying to fix the problem, even going so far as to reinstall the system software with no success. The woman on the phone finally suggested that I return the Mac for a replacement.
Has anyone else here with a 2009 iMac experienced this problem? Is it possible that it's hardware related? If so, could this be the tip of the iceberg suggesting a potentially larger problem down the road? I would have guessed it might be a software glitch. (The new iMac has thrust me, finally, into Leopard; until last week I was using Tiger on my older G5.) I bought the 3-year Apple Care with it--since the new iMacs have only been out a week, should I wait until the next Leopard update and see if that fixes the problem?
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Aug 25, 2009
After every reboot, the brightness of my iMac's screen changes to 100% brightness, which is slightly annoying. Does anyone know why this happens? By the way, I'd say it does it since 10.5.8.
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Sep 9, 2009
I have a Rev A (Aug 2007) alum iMac (20") and ever since I installed 10.5.8, the screen has been set on full brightness on every startup. I'm currently running Snow Leopard and the problem persists. I erased and installed during the procedure so I don't think it can really be a corrupted system file or something.
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Jun 30, 2010
Today morning, when i switched it on, I saw that the back fan is moving with more speed and sound . earlier, I never heard the fan sound. Also, on startup the brightness is set to max , while my settings was very low brightness. Howcome, its starting with max brightness now, when I dont have changed anything ? And what about the fan sound and speed? And yes, does the iMac has a battery also ? for what? Its always plugged to AC current, then what is the battery doing ? I never knew that. just downloaded istat pro and it shows HD 35 degree and Battery 55%. Wht is it ?
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Sep 3, 2014
Suddenly my iMac's display is very dim - almost can't read the text. The display brightness keys <F2> and <F1> don't do anything any more. How can you adjust the screen brightness?
Info:
iMac (21.5-inch Late 2009), OS X Mavericks (10.9.4)
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Dec 6, 2014
My iMac (27", late 2013, Yosemite) starts using the power button. A black screen, white Apple logo and progress bar appear. When progress is at ca. 50% the computer powers off.
Info:
iMac, OS X Yosemite (10.10.1)
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Jul 23, 2010
All of a sudden, every time I reboot, my screen's brightness is all the way up. So, I go to 'Preferences' and bring it down to only happen again the next time I reboot. Not a terrible problem, I hope, but not sure why the settings of this doesn't remain as I left it last. Perhaps I have picked up something OR I have a fault which could get worse?Anyone seen anything like this?
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Jul 29, 2010
Just got my new i7 in the mail today after waiting for the refresh for 5 months and it has that stupid high pitched noise that you get when you adjust the brightness. I returned four of these things at the beginning of the year (2 HD failures, 1 power source failure, 1 DOA), one that had the hd failure also had this same high pitched noise.
I love these computers (minus the complete lack of quality control), so I don't want to switch back to PC, but I am at my wits end here. Apple already gave me $150 off this computer for me trouble, but I just don't know if its worth the hassle anymore. I am returning it for sure, but would you ask for more compensation, maybe a ram upgrade or something? I don't like to be the guy who asks for free crap, but the way I see it, they can give me another hundred $, or I can go back to pc and they lose a customer for life.
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Sep 10, 2014
How to keep the Brightness meter icon from appearing on your screen?
Model Name: iMac Model Identifier: iMac12,2 Processor Name: Intel Core i5 Processor Speed: 3.1 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 6 MB Memory: 16 GB Boot ROM Version: IM121.0047.B1F SMC Version (system): 1.72f2 iMac (27-inch Mid 2011), OS X Mavericks (10.9.4)
Info:
iMac (27-inch Mid 2011), OS X Mavericks (10.9.4)
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Mar 17, 2012
My IMAC will not boot up. It was working fine this morning and I was working away then suddenly a MUSIC file wouldnt play, so I restarted the computer, and this is what happens now...It starts out like normal but after a period of showing me the APPLE logo it goes to the "NO" symbol. url...
Info:
iMac, Mac OS X (10.7.3), Snow Leopard
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