Sound stuttering after Mountain Lion install

iMacs are pretty much laptops. They use laptop components.

That's not true: Laptops use iMac Components 😝

Just had another crash, not doing anything CPU intensive, just editing a file in photoshop, the mouse started lagging, died after about a minute - rebooted.

An fully loaded 2011 i7 iMac with 16GB of RAM, 2GB video, 2TB disc space running Firefox, Thunderbird, Twitter and Photoshop should NOT be dying!!

My Imac was running HOT immediately after 10.8 Mountain Lion install, making it crash/shut off too.
i installed smcFanControl app and nor force my fans to run and NO overheating, This may help your crashing for the meanwhile.

I have been listening to iTunes on my iMac for about 2 hours now without a single skip. The room is cold. Seeing as most of these problems, or all of them occur on iMacs and Mac Book Pro's from what I've seen on this thread, leads me to believe that this is a heat related issue. Usually the back top right of my iMac is too hot to keep my hand on for very long (never thought this was right), but right now it's reletively cool. I imagine the air circulation on the Mac Pro's is just fine. Maybe Mountain Lion requires just enough processing power to push the smaller Mac's "over the edge" If this is the case, perhaps Apple needs to run the fan's just a bit faster in these machines. I've used SMC fan control before, and until then I never even realized that my iMac even had fans lol! You can really get them cranking. I don't really don't believe you should be using third party software to control the fans on your computer, however, so I deleted it. Maybe Apple is putting too much stock in the asthetics of their machines, and not enough into the performance sacrifices made for it. If you watch the key note on the iPhone 5, they keep talking about more power and smaller size. I used to build PC's before I migrated from windows and I know for a fact that graphics cards and cpu's generate heat, and you need to keep the case ventilated. Although, playing music on iTunes shoud not be so labor intensive that you computer overheats. IDK?? any thoughts?

Nope it has nothing to do with heat, i have checked temps on my rmbp and it runs alot cooler than my early 2011 mbp. No cpu stress only itunes or sporify is enough. Only thing what i have noticed is that coreaudio jumps up and down when sound stutters. When forcing only nvidia card to work it works better but it eventually stutters.. So no its not heat related. Has to be bug on drivers or on something and should be fixed asap **** this should be my studio machine for working. My trust for Apple is starting to fade ix they dont aknowledge this!

Running early 2008 iMac, 4gb ram. Mountain Lion with all the current updates and also a current model Macbook pro.

Using external usb sound card (line6 toneport/focusrite sapphire6) sound is distorted and stuttering when trying to record.

Works fine under bootcamp and had no problems under previous versions of osx.

Seems Apple is ignoring this. It has put a lot of projects for me on hold because I cannot record audio.

Using windows 7 under bootcamp to do my work is not why I own 2 Apple machines.

Not a happy chap. If this continues I will have to build myself a Windows machine and use that instead for work.

I really hope a fix is found soon. It's a joke because I can't do anything without the audio stuttering, and can't seem to work out why it happens. I believe it is flash or java connected as scrolling on web pages containing flash is often when I start to notice the stuttering. I can't play any instrument in Logic without stuttering and distortion. It's really not funny anymore as it has been going on for months. Apple please acknowledge the problem and fix it quickly!!

I can narrow confirm is heat related thing, when GPU temps reach 70ºc sound begins to strutter,and transitions go laggy. I have safari, autocad and mail running, i've downloaded smcfancontrol to ramp up the vents to keep gpu in mid 50's.

I'm freaking really scared this bug could damage hardware.

I'm one of the imac owners 3,4ghz, 2gb 6970m, 1tb stock.

Cpu and gpu can withstand 100 degree heat so you dont have to worry about that.. But on majority cases its nothing to sp with heat! On my case stutter is with idle temps and it doesnt occur in bootcamp

I've previously had a crash when I wasn't even at the computer. I'd booted it up, logged in, got distracted by something and came back about 10 minutes later just as the 'Your computer has restarted...' message was appearing.

As a previous poster has mentioned, I'm worried that something is really going fail on this machine soon and require a trip to Apple A&E...!

guise i reply myself as i have recently spoken with an apple technician.

what he told me to do:

1_reset PRAM

2_clear cachés

3_then create a new user account, name it test for example, and set an easy password.(i've used the computer always as a single user, so i didn't have to prompt pasword in a login). Restart the computer

4_log into that new user account, play something and then observe if there was no struttening (played a youtube video fullscreen)

5_no struttering happened, even fullscreen flash worked properly.

6_then i got back to my normal user

7_deleted that new user account

no strutenning after all, try that guise.

Regards.

Some diagnostics given now here, like yours ArchiResearch, are really not very akin to the original discussion.

A big number of people don't need to wait the machine to warm up for the problems to show up. Mine for example.

I feel my machine a little warmer sometimes, more than what I think would be good, but that is not what causes stuttering, I can start iTunes with my machine cold and it starts stuttering, I just tested it right now and got a hiccup at 53s of a song, with the machine cold.

We already have tried PRAM reset man, didn't you read the thread, people had just formatted and started from scratch.

Your reports are a bit different than most of the ones with the big deal problem, if it solved for you, great, and good luck for the ones which are experiencing something akin to your reports.

Also, this is not a Java/Flash problem, it's an Apple/Mountain Lion problem.

My CPU ad GPU were reaching 178 degrees, i am usin smcFanControl now, NO heat issue.

Apple needs to get this Mountain Lion FIXED!

1)Reset SMC

2)then PRAM right after you turn on the computer

3)Clean the whole Mac cache (under your user folder/library/cache and mac HD folder/library/cache)

4)Create a new user account, play a youtube fullscreen video, if no stuttering, change back to your original user and delete that new user account you have just created.

This fixed the problem for me anyways..

No more stuttering using either onboard sound card orexternal MOTU ultralite interface.