Currently Being ModeratedAug 31, 2011 11:22 AM (in response to kablamo)
I've experienced the same problem - twice now in the past couple of months. It's a series of three loud beeps, forcing me to shut down via the power button. The machine starts up just fine.
21" iMac - Mid 2010
Currently Being ModeratedSep 2, 2011 11:39 AM (in response to kablamo)
I experienced the same issue: my 21" iMac 3.6 GHz i5 with 8GB RAM and Mac OS X 10.7.1 freezes (only when I'm using Adobe Flash, either CS3 or CS5) and emits a sequence of three loud beeps, repeatedly. The cursor does not move on the screen, and the iMac must be forced to power down and restart. Here is a sound recording of the beeps:
I ran the disk diagonstic tool that came on the Installation DVD, but it did not turn up any memory issues or logic board problems, even in extended diagnosis mode.
The freeze problem has been happening occasionally, but usually without the beeps. Instead it had been a cacaphony of random loud digital crunchy bit sounds.
Currently Being ModeratedSep 3, 2011 8:39 AM (in response to Lucky13)
As a follow up, I just heard one series of five beeps - while casually using my iMac. They weren't nearly so loud and the computer didn't lock up - but I think it's trying to tell me something!
Currently Being ModeratedSep 7, 2011 5:15 PM (in response to kablamo)
kablamo - I've removed the RAM, but the jury is still out the beep-hang didn't happen so regulary and by no obvious reason so it's kinda hard to tell yet if it's working. But so far (three days) no hangs
Part of (for some reason) also suspects Safari, witch is my primary browser...
I'll give it more time without the RAM, then I will check the memory with memtest, and if they checks out maybe try a different browser...
How's it going for you?
Currently Being ModeratedSep 7, 2011 9:47 PM (in response to Storbastan)
Happened to me twice tonight. The first time I was running only Safari and nothing else, so the rest of the night I ran firefox and wasn't having any problems for ~3hrs. I inadvertently ended up with a bunch of programs open, including 1password, iTunes, iPhoto and Firefox and it locked up again with the 3 beeps.
Maybe the next step will be to remove the RAM, but I'm leaving on a trip in a few days so I may just wait until late September when I return.
Currently Being ModeratedSep 8, 2011 12:52 AM (in response to kablamo)
I have the same problem, but I never use Safari. I am sure it has to do with the extra RAM.
Has anybody tried to check this article about fan speed?
Currently Being ModeratedSep 13, 2011 7:27 PM (in response to kablamo)
I've had the same issue with a 27" iMac with upgraded RAM (4x4GB Kingston RAM). I've since given away my original RAM so I can't test that out. I've tried every memory test I can find (including the AHT - extended). I tried Rember.app by Eddie Kelley and memtest by Tony Scaminaci. I've let those test go for almost 24hrs with no issues found.
Sometimes the three beeps are at the normal "startup chime" volume,other times I get extremely loud beeps or extrememly loud distorted audio "crunch" (not sure how else to describe it)
It seems to happen most often when NOT using memory intesive applications. I may bring it into the Apple store soon, but I'm worried they'll dismiss it as a Kingston issue. :-P
Currently Being ModeratedSep 15, 2011 2:47 PM (in response to kablamo)
I just recently had this issue. It happens during the day while I'm away at work. I have also upgraded my ram using crucial about a year ago. My computer is also set to go to sleep during the day.
Currently Being ModeratedJun 20, 2012 10:57 PM (in response to kablamo)
My new iMac mid 2011 (i7), bought in Christmas, with 12 GB RAM, yesterday made 3 beeps when I put Windows 7 x64 (installed with Boot Camp) in sleep. Two RAM modules (2x2 GB) are the original (Elpida) and the others (2x4 GB) are Kingston modules (certified by Apple). Today, when I started up the iMac, no sound and white, blank screen. When I forced off and restarted, it worked fine.
I will do the AHT.
I'm an italian 14-age student and my English isn't perfect...