2011 iMac freezes in Windows

Discussion in 'iMac' started by Chris5488, May 13, 2011.

  1. Chris5488, May 13, 2011
    Last edited: May 13, 2011

    Chris5488 macrumors regular

    Feb 26, 2011
    EDIT: Just happened in OSX too! Starting to think it could be the RAM I installed extra (2x4GB 1333mhz from Crucial)

  2. iSayuSay macrumors 68040


    Feb 6, 2011
    Well .. try to unplug any third party RAM you installed yourself..
    If those things still happen .. that would sounds like failing unit, maybe the USB ports has problem.

    Time to contact :apple: I suppose? While it´s fresh, you should bring it back to oven :)

    Relax, you still under warranty
  3. Codpeace macrumors member


    May 13, 2011
    Yeah it could be a ram problem. They can be very bizarre and hard to track down. Is there a ram test program in OS X?
  4. ashman70 macrumors 6502a

    Dec 20, 2010
    As others have suggested, put it back to the way it was when you got it and see if it still freezes.
  5. Benz63amg macrumors 68020


    Oct 17, 2010
    its not the ram, its something with your usb devices. try to remove the ram and check
  6. Chris5488 thread starter macrumors regular

    Feb 26, 2011
    I removed the RAM, now waiting for a freeze... :(
  7. Chris5488 thread starter macrumors regular

    Feb 26, 2011
    Alas, it happened again :mad:. This time while I was testing Flight Simulator X on Windows, during file transfer from my WD MyBook to the Seagate.

    It worked fine for 2 hours, even installed FSX during the file transfer and everything went fine, but later when flying it happened again.

    Could it be a faulty Firewire800 port which is causing this? The freezes always happened when the Seagate was connected (by FW800). The 1 time it froze in OSX only the Seagate was connected, however I wasn't using it. Or it could just be a coincidence...

    Pff I was hoping it would be the RAM, now I have to bring it to a local Apple store and let them tear it up apart :mad:
  8. Nishi100 macrumors 6502a

    Mar 27, 2010
    I think that Windows 7 is using the external hard drive as virtual memory (paging) - that's why it only happens when it's plugged in AND when you're using a lot of RAM: playing a game and copying stuff. So, when Windows 7 needs some extra RAM it'll speed up the external hard drive, to then use it, essentially, as RAM. This is when your computer freezes - it's waiting for the external hard drive to speed up.

    To test this disconnect all external hard drives - if it doesn't happen again then I'm right. To stop it from happening, when you have external hard drives plugged in, buy more RAM.
  9. Georgio macrumors 6502


    Apr 30, 2008
    Essex, UK
    Stick your extra RAM back in and seeif it still happens. If not then it's probably your external drive, try a different method to connect i.e. FireWire to eliminate a USB problem.
  10. TheUndertow macrumors 6502

    Feb 20, 2011
    Sorry dude...Do you have to remove the screen and open it up every time to troubleshoot and add/remove the RAM?

    If so I feel for ya...I wouldn't be able to handle the headache and stress of keeping that screen dust/fingerprint/gunk free.

    More and more I'm thinking that BTO makes sense for me...I like saving money but I also like saving the hair on my head from falling (or being ripped) out.
  11. Benz63amg macrumors 68020


    Oct 17, 2010
    i told u its not the ram man, its one of your external devices with combanation to windows 7 being used.
  12. telepati macrumors regular


    Jan 20, 2009
    Same problem here. But I found a solutions in MacRumors older posts. My iMac freeze and I cant move anything. My BootCamp doesnt work either. And most comment problem is I dont see Windows Boot on Startup Disk everytime wants to boot I use ALT/Option key. I must to restarts 2 times than after open my windows but when I want to turn my OSX I must to 5 or 10 times restart and ALT/Option key combination and my OSX stuck on Blue Screen. Im really crazy about that 2 days. I cant boot from OSX DVD I try everything. I opened BootCamp but didnt work. Give me a errorlike that;

    "Boot Camp Assistant cannot be used: You must update your computer's boot ROM firmware before using this setup assistant"."

    I found a solution in this link for my problem your problem looks like a mein;


    1. Inserted OSX install DVD in drive.
    2. Started the computer with Command+Option+P+R (PRAM option) and selected the OSX install DVD as startup disk.
    3. Selected Disk Utility from Utilities menu and selected Repair Permissions. He said this is a bit different from the option we use from within an installed OSX.
    4. Restart (I saw a small message- Boot Cache something.....)
    5. He then installs a Performance Update. This one was apparently not shown in Software Updates.
    6. Deletes a few preference files.... I could not see which ones.. but he removed at least 4-5. DO NOT DO THIS on your own.
    7. 2-3 restarts and my mac is up and healthy. Boot Camp runs fine. Dual booting is fine too.

    I used 1 to 4 and everthing works perfectly now. I seeing my Windows Boot on Startup Disk and no freeze everthing works. Very fast Booting. I get amazing performance.

    PS: If your are using Tuxeda NTFS you must to delete on preferences panel on MAC.
  13. Chris5488, May 14, 2011
    Last edited: May 14, 2011

    Chris5488 thread starter macrumors regular

    Feb 26, 2011
    Ok thanks for all the input everyone!

    Problem is 'solved' :)

    Apparently it's the Seagate drive, not the drive itself but more specifically it's FW800 cable/adapter.
    I went to a local Apple Premium Reseller (no Apple store's here) and told them my problem.
    They said it could be the external hard drive; according to the guy who helped me a faulty drive could damage the iMac (wrong power...voltage...thing) so a built-in safety-thing kicks in which results in a freeze.

    He even told bad periphirals could damage the logic board :eek:. So "Unplug it and check if it still happens". Later when I came home I searched the internet and found more people who experienced freezes with some Seagate external drives, using USB3.0 or FW800. Well my Seagate also has an USB2.0 output-cable, and that worked fine on my PC a few weeks ago before I had my iMac, so I used that one now and no freezes anymore! Problem solved! Put my RAM back in since that wasn't the problem, and indeed everything goes fine now!

    So the Seagate Firewire800 adapter is the problem. I'm not risking another FW800 adapter so I'll wait for the Thunderbolt adapters :D. In the meanwile USB2.0 will do fine.

    Anyway thanks for the help! I hope others could learn from my experience knowing now that a freezing Mac can be caused by an external hard drive.

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