IMac :: Sporadic Audio Distortion On 24"
Mar 27, 2010
I have a 24" Intel iMac, with the latest version of Snow Leopard. I bought it last July and have AppleCare. For as long as I can remember I have this problem with it:
* Every 30 seconds, almost to the second, the audio from the built in speakers distorts and gets slightly louder. This lasts about half a second then goes back to normal
* It only manifests through the internal speakers, it's fine through headphones
* Rebooting makes it go away temporarily
* I've reset PRAM and SMC to no avail
* I've tried turning Time Machine off to no avail
* I've taken it into my local Apple Service Centre, they couldn't replicate the problem, it only seems to happen in my house (every room I've tried it in is the same)
* I bought an expensive power filter/conditioner, this hasn't helped at all
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Dec 13, 2009
I have a Core Duo 2006 Macbook 2ghz, 2gb RAM, running 10.6.2 and whenever the CPU is taxed for an extended period of time, chances are I'll get some audio issues. What usually happens is that the audio will stutter for a second or so, then change instantly into a heavily distorted 'bitcrusher' output. The only way to resolve this is to restart whatever program is outputting audio. So far, this has happened in both Firefox & iTunes.
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Mar 10, 2010
I'm having issues with audio distortion on my BLUE Snowball mic. This happened in GarageBand on my old MacBook running Leopard as well as my new MacBook Pro running Snow Leopard. I've tested mics, cables, and USB ports. Nothing is consistent.
I'm using 3 mics simultaneously. The distortion doesn't not occur in any predictable manner. Sometimes it's present from the start, while other times it doesn't happen until I'm halfway through my podcast. It's not clipping audio, more-so clicks and interference type noise. I've read some people saying there are often issues with audio drivers and USB, and others saying that it's because the power going to the mics from the USB port is dirty.
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Jan 9, 2010
Sometimes, while watching a streaming video on my Macbook, the audio begins stuttering and tearing (that's the best way I think to describe it). Pausing and refreshing the tab is useless, and, usually, closing and reopening the browser is equally useless. This problem is not limited to just one steaming site -- issues occur on Youtube, Hulu, Megavideo etc... For about ten minutes (though sometimes longer), the audio across all programs on my Macbook does not work properly until the problem mysteriously solves itself.
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Oct 13, 2008
I recently got my MBP and I noticed there's a issue with headphone audio distortion. When I plug in my earphone or headphone without any sound playing, there's a clear whining noise like zi zi zi sound which is really clear, sounds like old 80s radio noise. When I play the music, of course it was covered by the sound of music but it really bugs me out knowing that I cannot listen the pure sound of my music. The volume of this distortion noise would not change while I turn up or down the volume of my MBP. I asked someone professional, he said it's a famous issue of screen frequency disturbing audio in macbook pro.
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May 26, 2010
whenever I'm listening to music or watching a video after a while the audio will drop out, stutter, or become horribly distorted. If I pause the video or music for a second then start playing it again the output will be okay for a few seconds to a few minutes then stutter again. If I leave it stuttering the output will either eventually go back to normal or just stay stuttering or muted. Once or twice I've got a 'you need to restart your computer' kernel panic error (log attached/linked to below) and twice my computer has seemingly randomly restarted itself.
I know it's not an issue with my connection as it happens on locally stored files as well as streaming media. I know it's not a hard drive issue as I've had the problem across two different hard drives (I used the Migration Assistant to swap my stuff from one HD to another, presumably bringing across whatever causes the problem). I've had it with two sets of RAM as well. It happens whatever web browser (for streaming media) or music/video player I use for local files. If I restart the computer I get a longer period of time before the stuttering starts, and it gets more frequent the longer I leave my computer running - a RAM issue maybe? These screengrabs where taken either during or shortly after the stuttering had taken place. This top output is after a particularly bad stutter: and here is a log following a kernel panic: [URL]
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Feb 11, 2008
The "new mail sound" in Mail.app is still very sporadic. When new e-mails arrive in the inbox, the sound signaling that a new message has arrived only works less than half of the time. This was the same problem in 10.5.1. (White 17" iMac C2D 2.0, 3 gb ram) [URL]
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Sep 13, 2008
I have a first gen Mac pro, I am getting a sporadic lock up where the screen freezes, and it stops responding to keyboard and mouse input (and it becomes inaccessible from the network). This has happened in normal use twice.
I have tried several times to run the Apple Hardware Test off the original Os X disk, but it locks up up every time in that mode. It also locks up immediately when I boot into single user mode (which I did in order to attempt to run memtest). At least it refuses keyboard input in Single User (with my normal bluetooth keyboard, as well as a USB keyboard that I borrowed).
I did run memtest from a terminal window while logged in normally, and it was able to access 11 of my 12 gigs of RAM, and it passed, so I guess I am 11/12ths sure it is not bad RAM.
When the system does lock up, when I do a hard power cycle with the button on the front of the machine, it will not reboot -- my screen remains black. If I let it sit for a minute or two like that, then power cycle again, it does boot up normally. This is very consistent on these lockups - no boot the first time, works fine the second.
In general, I think it is running hotter than it used to -- at least it seems like the fans are running at high speed more than they used to, but I can't swear to, or quantify that.
I was on the phone with Apple tech support for about an hour yesterday, and he finally decided it had to be taken in for service.
I wanted to see if anybody here has any ideas what the problem might be, especially if it is something I could fix myself, before I lose the machine for however long it will take Apple to fix it.
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Jun 21, 2010
I have a 2008-era MacBook Pro and I am using a Belkin Wireless G router with Road Runner cable internet. I've been having sporadic internet outages. Things will be going great, and then all of a sudden, my connection will die for 15-30 seconds at a time. Websites won't load. In the network diagnostics utility, it tells me that my ISP connection is dead and then it will cut back on. This happens several times per hour. I originally thought it was an issue with my ISP, and then I decided to spend a day just working in Windows Vista via Boot Camp. Well, there were absolutely NO outages and pages loaded WAY faster than they do on the Mac side. I also tried plugging in the cable modem to the computer. There were no problems there either. Since I can use WiFi without incident in Windows and hooking the cable modem directly to the computer causes no problems on the Mac side, I can only conclude that there has to be some sort of settings problem that is causing this.
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Nov 11, 2009
My friend is looking into buying the new 27" iMac Core i7 to replace his PC desktop. The only thing holding him back is that he has an analog surround sound system he uses for his speakers. I am having a hard time myself finding a converter that can make his speakers work in the iMac's optical digital output port. Any products out there that will do that?
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Dec 19, 2007
We just updated our G5s here at the lab (QuickTime and Garageband ), and now the sound output is extremely distorted and crackly regardless if its a video on cnn or a song off iTunes. Tried Zapping the PRAM and repairing permissions, even reinstalled QT from the standalone installer on apple to no avail.
Information:
MacBook Pro
Mac OS X (10.5.1)
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Dec 3, 2009
On my Al macbook just recently when I hit Cmd-T to open a tab, safari starts to stutter, beach ball, and a distorted screen image (the size of the browser) appears for 3-5 seconds and the tab finally becomes available. what is going on here and how can I fix it? Never had a problem before and I'm using the latest Safari update.
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Jan 6, 2008
I have made a movie on iMovie HD (using a Mac Book Pro) and have burned it onto DVD using iDVD. When I play the DVD on my TV or another iMac there is distortion during any rapid movement, e.g. a quick moving arm appears jagged and lined. There is also a slight blurriness to the general picture (the sound is faultless). Why this distortion is occurring?
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Jan 28, 2009
My MB started doing this really strange thing where the screen gets all weird and distorted when scrolling. There are photos to show what's going on.
I have 4GB of OWC memory installed, but this was happening before I installed that so I can kind of rule that out.
Has anyone else had this happen, or know what causes it. I've tried all of the usual fixes like a fresh Leopard install and combo updates.
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May 10, 2012
I am having a problem playing some mp4 files through Quicktime. When the video is played in Quicktime (or Pro Presenter 4), portions of the video turn into distorted white blocks that move with the video. It doesn't continue throughout the whole video, but I can't discern when or why it only affects certain portions. It does it every time at those places in the video. I downloaded VLC, and the same exact file plays perfectly fine in VLC and on other computers through various programs. I have only seen this problem on this computer.
Is this a codec issue? How do I fix it? The files in question are mp4 files using h.264 video and AAC audio at 1920x1080 resolution. I can play other mp4s using h.264 and AAC without any problems.
I have only had this problem with one of the companies that we periodically hire to produce videos for us. I'm guessing that it has something to do with the way he encoded the video, but I have no idea what the problem is. It's probably not his fault if it only distorts on this one computer.
Here is what the white block distortion looks like:
Info:
iMac, Mac OS X (10.6.8), 3.2 GHz Intel Core i3, 4 GB RAM
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Apr 9, 2010
what I imagined was a documented 8600GT nVidia issue with my SR MBP (purchased in April 2008 without Apple Care, d-oh), turns out to be a different issue altogether. The display gets distorted and it seems as if the LCD needs a v-sync controller. I have posted a video of it here[URL]. If I move the LCD slightly the distortion will go away. But it inevitably returns after a while. It gets unusable for that period of time. Oddly enough I can go hours without this problem manifesting, and then hours when this problem doesn't go away.
My recourse has been to connect an external monitor to the MBP, and it works great that way. So I am pretty convinced that it is an LCD/Cable issue as well. The Genius seemed to believe it was an LCD issue as well, something about the cable being torn or stretched or something. He quoted an amount ~$650 to get the whole assembly changed. Here's my dilemma: this is my work machine, and I can't afford to have it gone for a few days/week. Is there anything I can try at home before handing it to Apple for repair... like try and reseat the cable... I have opened the MBP in the past to replace the HDD. Should I even bother to get it repaired, if I can't fix it myself, or should I just save the money and get a new MBP?
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Jan 22, 2009
Just got a new white MacBook yesterday (MB403LL/A) and have noticed, that depending on a slight change in viewing angle, pastel colors can get really distorted, even appearing as other colors, e.g., light green->gray and light orange to pink. One example would be Google calendar when editing an event. Looking at the screen in a normal position, the background appears gray, but when slumped down in my chair it looks green (the actual color). Is this a normal problem with MacBooks or could my display be defective? I took a couple snaps with iPhone that didn't turn out to hot but illustrate the point:
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Jun 22, 2010
My two previous older macs have been perfect to me, but this new MBP I5 model is giving so many issues lately. Every once in a while, my computer's graphics (I am assuming) goes crazy, and I get this pixelated distortion that's right in the middle of my screen that's about 2"x5" on my 17" screen. This happened just earlier, while I was using Safari. However, even after closing all of the Safari windows down, the distortion will still be there, and will stay there regardless of what I have or don't have open. Logging in and out will fixes the problem, and everything goes back to normal for the mean time. Any one ever experience similar problems or know what I could do to see what's going or fix it?
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Oct 20, 2008
I have a Mac Mini (OS X 10.4.11); internet & email worked fine when I had it hardwired to cable. I've since moved it to the other side of the house and it has problems connecting to the wireless network (linksys router). The wireless network is strong, and my laptop (PC) never has any problem connecting. The Mac, however, sometimes connects no problem and works well for a while, and then just dumps the connection and won't reconnect. I can't figure out what makes that happen. I finally get frustrated and walk away, and an hour later when I walk back it's working again. The signal strength indicator will vary from full signal strength to zero (even though my laptop never has any problem at all connecting). I live at the end of a cul-de-sac with basically no neighbors, so I don't see there being any sort of interference. I stopped by an Apple store today and the best the salesman could do was blame Comcast, my internet service provider.
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May 9, 2010
I've just received a brand new MBP 15 i7 with high res. matte screen. Occasionally the screen becomes sort of distorted by red pixelated shadows that seem to depend on the current wallpaper, and also to some extent stay in the background when white background windows are opened. I have posted a picture taken by camera on Flickr, since a screenshot will not capture it. The funny thing is that I can make it disappear by closing the computer and reopen it again. I cannot force it to appear again though. Is it a driver problem? It doesn't appear on the startup splash screen or on secondary monitors. Here is the photo of the phenomenon: [URL]
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Jan 26, 2009
I have quite an old toshiba 32WLT66 hdtv with my mac mini connected to it through HDMI. I did have it connected with vga and a separate audio cable, which worked out, but I wasn't happy with the picture.
The picture is now great with HDMI and as I'm using it mainly for movies through plex I am putting up with the overscan when using it for occasional web browsing.
My question is what is the best solution for getting audio when using hdmi? I have seen some posts where people have suggested looking at the tv settings to force the tv to accept audio through another source when using hdmi. This doesn't seem to work, or it only (might) work on my first hdmi port (when I connect the mac mini to the 1st hdmi port, the picture is very distorted and doesn't appear correctly - so this option is ruled out).
The other solution I'm aware of is connecting to an external amp and speakers - can't so this as I don't have them.
The second option being a set of USB speakers, I believe this might be my only option, but I would rather have the audio coming through the tv as I don't want the clutter of another set of speakers.
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Sep 9, 2009
I'm looking for a good quality Audio Interface for my iMac, i work with MIDI only so i won't be needing tons of ins & outs for vocals, mics, live instruments etc, the only thing I'll be needing to connect is a Digital Piano (MIDI ports) and a pair of Monitor Speakers. what are the best AI brands out there for a iMac ?
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Mar 29, 2009
Long story short, My iMac stuffed up not long ago so I sent it to Apple to get it fixed (Apple Store Chadstone), I called them a week later, and I�ve been told that they were still working on it. A few days later I called again, they finally found the issue (sort of) and decided to replace the logic board�..anyway, I said OK, they later called me back saying they have replaced it but a new problem occurred, the audio/speaker is not functioning etc� I said well I will just take it back and fix it myself because I need it for �work�, I took it back and this is what I found so far: iMac�s serial number is gone! Oh also, on the repair report paper, it says I purchased this iMac on March 11 2009(March 11 is my birthday BTW), but I actually bought it in Nov 2008, so according to Apple Store, my iMac is now officially out of warranty.
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May 28, 2010
I am somewhat a new person using a mac and I know this can be done with a windows computer. I was wondering if there is a way to play audio sources from my MBP to an iMac while using the speaker on both computers. Does it revolve around the "Audio MIDI Setup"? In my workplace I can play my music when the customers are not around or if it is after hours. I have my iMac at one side of the store but i'm unable to hear it when I walk into the back. I wonder if I can play my music, from both computer at the same time.
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Dec 30, 2007
I have the white iMac, not the brand new model, and I always thought that the audio out would accomodate a mini-plug OR an optical cable. Right now I was trying to switch from a mini-plug-to-RCA to optical (TOSlink), but I see no way to fit the optical cable into the mini-plug (headphone) audio out on the iMac. Do I need some kind of adapter? Do I need to remove something in the audio out jack?
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Sep 29, 2010
Has anyone tried using their mid-2010 imac with hdmi and can confirm if audio (out) works? All the adapters seem to claim audio support with the refresh macbooks but do not mention iMAC. On the Apple store they sell a moshi adapter that lists iMAC support but specifies early-2010 models. Is apple deliberately crippling the new iMACs to *not* allow audio over displayport>HDMI or what is the real story? Some older support threads seem to talk about it working on their 2009 imacs until they upgraded to os 10.6.4. I have tried a few generic cables/adapters but they don't seem to talk audio to my receiver. Anyone had better success?
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Jan 13, 2010
this will sound more complicated a setup than it really is..I have the following all connected together:iMac 21.5" (Late-2009 spec Denon AVR-3806 Amp Panasonic TH42PZ80 full-HD Plasma TVNow, for audio I have a simple optical to coaxial convertor which feeds directly into the input on my amp. With this I get full 5.1 surround
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Jul 8, 2010
I am running leopard on an iMac 24" and am having trouble getting my iSight camera to record audio on 2 channels. I have changed my audio input to line in (inbuilt input) in order to record using a better microphone than the inbuilt one in my iMac, and am running a Shure microphone into the input in the back of my iMac via XLR to 1/4" stereo jack cable and then through a 1/4" to 1/8" stereo jack adapter. However when recording video in Photo Booth, iMovie etc. the audio only plays back out of the left speaker. It is not a problem with the output because all of my other sounds (music from itunes for example) play fine out of both left and right speakers. I believe I have run everything into the computer just fine and I can get 2 channels when recording like this in Garageband and Logic.
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Jul 28, 2010
Professional composer here. I want to get a computer for my brother to start learning the ropes and I was waiting for the new imacs to come out. The question is how will these computers respond to audio programs which are created to be multi-processor intensive.
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Mar 26, 2012
I'm looking to buy an iMac i7 3.4GHz with 256 GB SSD for professional audio use. I'm wondering if it would be faster to stream audio samples from an additional 2TB internal hard drive or an external Thunderbolt drive.
Info:
iMac, MacBook Pro, Mac OS X (10.5.2), Logic Pro
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