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I've had my iMac 24" 4850 for four days now. For the first three days I had endless crashes like so many others here. It crashed doing pretty much anything, just navigating the local drive on finder, using migration assistant, playing WoW, etc. The time between crashes varied, sometimes minutes, one time as long as a couple hours though that was after I connected to airport via wire, though I still had airport on.
Last night I turned airport off and just used the wired connection and the crashes have stopped completely. I had WoW running for about 7 hours total, though some of that it was sitting idle. I have downloaded xcode and a number of other things, transfered things from my laptop, etc. Not a single crash. This seems to have fixed it for me.
Thanks! It seems to bypass those freezing problems successfully. Disabled my AirPiort in the morning after reading this and haven't had any freeze for now. I'm kicking the iMac to it's limits since then, doing some DVD ripping / enconding stuff, leeching the **** out of the net, running 3 virtual machines in Parallels, etc... all at the same time. It's still running... :-D
I got my new 3.06 iMac with the 4850 last Monday, and have had near non-stop freezes since. I'm using a wired keyboard and Apple bluetooth mouse, and ethernet broadband (airport is switched off, not just inactive). I've tried a wired mouse, and it didn't make any difference. I'm also using FanControl with the settings set fairly high, and even when I only have temperatures in the 30s and 40s, I still get freezes. I don't think there are any problems with the disk, although it has frozen a few times in the middle of verifying the disk and the permissions.
It freezes a lot at random, but Safari is one thing that's guaranteed to cause problems. When I first got the iMac, any other application that used the internet seemed to work OK, but when I loaded up Safari the loading bar would get about a quarter of the way across, then stop and I got an endless spinning wheel. I could then force quit out. Bizarrely, I found that if I used my broadband hub manager, which opened safari into a different page, it would work and I could then visit different pages, although it would ten freeze after a few minutes, particularly if I tried to download anything. I tried using Internet Explorer. It worked, although slowly, but again it would freeze if I tried to download anything.
Today though, things have got worse. Now, the loading bar doesn't even start in Safari no matter how I open it, and it freezes if I try to force quit.
It's a beautiful computer and, when it briefly works, I really like it. Until today, I could play WoW quite happily. Now though, I can't even load WoW without a freeze, so my iMac really is reduced to an attractive paper-weight. I'm not sure what to do. I can't imagine that any of the suggestions the helpline would give me (PRAM, reinstalling etc) will help, and what are the chances that I'll get a working model if I get a replacement? I play games quite a lot, so going back to the standard graphics card isn't really an option either.
This issue is clearly widespread enough to start getting reported. Have Apple not made any admissions that there's a problem?
I was getting freezes right out of the box last Friday upon setting up the new iMac. They stopped on their own. It's been exactly a week since I began having better luck.
To clarify though: I never touched the airport, and I'm using it right now. I don't have any bluetooth devices (mouse, keyboard) but bluetooth is set to discoverable.
Sorry - just a little more info. I tried turning the Fan Control settings right up (upper temp threshold 65, slowest fan speeds all 4000) just to say what effect it would have. Safari now just opens normally and seems to run quite happily, but WoW is still freezing. Safari working is nice, but I'm slightly concerned about having the fans running so fast all the time. Ignoring the noise issue, does anyone know if this is likely to damage anything?
Temperature is obviously a major issue, but why has it changed? Yesterday, Safari was the real problem but WoW never froze, now I can get Safari running but WoW is hopeless. All very frustrating!
Add my name to the list: 2.93Ghz ATI 4850, freezes when watching HD video especially with flash based players.
On average about two freezes every 4 hours.
Very frustrated. Apple have f£%d up big time here. This is my first MAC, I have an iPod touch for more than a year, the experience impressed me so much I wanted to move to a MAC. Now I want to move back to Windows. I have an XP computer in my living room for 4 years which I use for HD Video and home cinema, never had a single crash with the system, works every time.... MAC though *****, unusable for HD.
What makes this even more frustrating is that I had to wait over a month for the 4850 card. I could have bought a Dell and had it delivered the next day.
I bought the Apple Protection plan, called on Thursday and despite all of the postings related to this problem in the iMac forums, Apple Support seems to be blishfully unware of the problem.
They got me to reset "cntrl / cmd / p / r", no use, I ran the diagnotic tests... found no problems. I will give them a week and then I will look for my money back, use the money to buy a Dell and have some left over for my Summer holidays.
Hi all, some updates:
Returned the machine. In my second machine I plugged in the ethernet and turned off the airport... I haven't had a freeze yet and I've had it for 3 days.
I've successfully gamed for 5hours in bootcamp (GTA4)
Left it on all night doing downloading
Did a 4hour migration using timemachine
I could turn on the airport and see if the 2nd machine has the same problem... but i'm confident that a software fix will eventually come and I've had it trying with packing and sending and spending days without a computer.
Good luck to the rest of y'all.
Heeere. weeeee. gooooo.
My brand new iMac is a 2009 3.06GHz, 24" iMac, 4GB RAM with ATI Radeon 4850. And it's freezing mostly on playback HD video. It froze about 3 times within 2 days. First I thought it would be a problem of a bad videocodec, but also my own produced videos are freezing with a simple H264 codec.
Great stuff. I have been waiting for this new iMac "Release" since August 2008... all the time waiting and waiting for a new iMac and after 7 months of waiting I buy the highend version of the new iMac and Apple comes along with such a "problem"... well I hope for a QUICK! fix/patch.
I need to use the built-in Airport-Module...
I'm a kinda upset right now :/
Everyone saying it's an Airport issue; are you using an Airport Extreme or Airport Express, or a third-party wireless router?
I have the same iMac model and have had no issues since updating my SMART monitoring software. YMMV, as always, and not claiming that's a fix for everyone. But FWIW, I'm using an Airport Extreme.
Well I running with third parts router a DLINK and I had 5 issue frozzen time under 10days but i desired to test to drop airport and works good. .well I dont thinks u have better luck with replacment.. and what, maybe u gonna get a replacement iMac with bad pixel or backlights bleeding or worst of all noise fans brrrrrrr I dont wanna thinking about all other issues u can get round the corner.
Count me in! Had my 3.06 GHz, ATI Radeon HD 4850 for two weeks now and its pretty much freezing twice a day. Has frozen in various programs including Safari and graphics software but mostly when playing dvd or shows from the internet.
Been running fan control also as my computer like some others on here is running really hot, its almost heating my flat.
Still froze last night. I'm on airport but need airport. This is a real pain, I need this computer for business, really losing faith in Apple big time! 5 weeks to arrive and then this. Will ring them today.