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iMac Freezing Issues...

6287 Views 25 Replies Latest reply: May 9, 2011 6:53 AM by B33-J4Y RSS
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B33-J4Y Calculating status...
Currently Being Moderated
Jan 19, 2011 11:55 AM
Hi,

I purchased a new iMac around July/ August. This Mac worked fine for all my needs but within no time at all Apple brought out a new version. Due to this, they allowed me to send mine back and get the new one as it had been so close to release.

Therefore, i was able to get the newer version using the i3 processor with 4x2gb of RAM and 1TB hard drive. My problem is, it is very slow to start-up compared to the previous 'new' one (From a matter of seconds to a matter of minutes), and also, this Mac consistently freezes randomly when it is left on for a while.

My old iMac and Macbook before that practically never crashed and were very fast to start up yet this one which is supposedly better is experiencing constant crashing and slow start-up. I admit i leave it on most of the day (although it sleeps quite a lot) but this happened with my previous 2 Mac's and they never had any issues - Also, it doesn't seem to get too hot where it is so i really have no idea - Why is my better Mac worse?

Any help would be great.

thanks,

Martyn
iMac 21.5" - 3.20GHz Intel Core i3 - 8 GB DDR3, Mac OS X (10.6.4)
  • WZZZ Level 6 Level 6 (11,880 points)
    Currently Being Moderated
    Jan 21, 2011 8:30 AM (in response to B33-J4Y)
    For the slow start up: In System Preferences>Accounts>Login Items. How many Log In items? Also check in the HD Library for Startup Items, Launch Daemons and Launch Agents. Did you install any new software when you got the new Mac?

    When do the freezes occur? Can you relate them to anything you are doing around the same time? Next time you experience a freeze, open up Console in Applications>Utilities. Go to Files>system.log and see what is logged around that time.

    You might want to throw Applejack which is a very useful and safe troubleshooting and repair program at this problem. First run it in Auto mode. Type in "applejack AUTO" then, when that has finished running, go back and run it in "applejack" steps 3 & 4 only for the system and your user. Note that for the first several start ups after, the computer will take longer to boot as caches are being rebuilt and it may take several restarts to notice the full benefits, if any.

    download
    http://sourceforge.net/projects/applejack/

    article on using it
    http://reviews.cnet.com/8301-13727_7-10334620-263.html?tag=mfiredir

    Freezes may sometimes be caused by USB devices. Disconnect all USB devices except the keyboard and mouse (if wired) and see if the freezes stop. Are you running a non-powered USB hub?

    Also, boot in Safe Mode by holding the shift key down at startup. Give it time; it will take much longer to boot this way. This will load a stripped down system and disable some third party software. If the freezes stop in Safe Mode, then it may be some incompatible third party application or program which is responsible.

    http://support.apple.com/kb/HT1564?viewlocale=en_US

    Also create a new admin user account to test to see if the freezes stop in that account. If they do, then you know it is something local to your regular account and not system wide.

    Message was edited by: WZZZ
    iMac G3/400 OS X 10.4.11, iMac 21.5" OS X 10.6.5
  • WZZZ Level 6 Level 6 (11,880 points)
    Currently Being Moderated
    Jan 22, 2011 6:00 AM (in response to B33-J4Y)
    Which applications open at start up? Besides Applications there may be other things opening. Check Login Items in SysPrefs Accounts.

    HD Library: open the Macintosh HD folder from the sidebar of a finder window or from the Desktop. It's right there below Applications.

    Disconnect those USB devices and see if the freezes stop. I had an SD card reader that was causing freezes, even if it wasn't being used.

    Have you checked in the Console log where I told you to look? Note the time of the next freeze and have a look in there.

    Also, if you are doing hard shutdowns when these freezes occur, you should open up Disk Utility in Applications>Utilities and verify the drive. Not allowing the system to shut down gracefully can cause problems there.
    iMac G3/400 OS X 10.4.11, iMac 21.5" OS X 10.6.5
  • roam Level 6 Level 6 (13,545 points)
    Currently Being Moderated
    Jan 22, 2011 6:30 AM (in response to B33-J4Y)
    Hi

    the option to repair is not clickable

    To repair your hard drive, you cannot be booted into it when the repair is being done.
    Instead boot into your Mac 10.6 OS DVD and then use its disk utility to repair your internal hard drive.

    To do this: Insert the Install DVD into the drive and then select Restart; when you hear the chime hold down C key until the apple logo appears.
    This will take you to the installation software, but you do not want to install.
    Select your language, then go up to the top menu bar and navigate to the Disk Utility application.
    Select the hard drive on the left, then go to the First Aid pane where you can click on Repair Disk.
    If it finds errors, repeat the process until it reports no errors.
    After these repairs, quit the Installer, and restart normally.
    iMac (Core 2 Duo, 2008) eMac (ATI) iBook (G4) 10.3, Mac OS X (10.5.8)
  • WZZZ Level 6 Level 6 (11,880 points)
    Currently Being Moderated
    Jan 22, 2011 7:15 AM (in response to B33-J4Y)
    I don't know iAntiVirus, and searching around I didn't see any awful reviews, but it may be causing some of the issues you're experiencing. There are no viruses for Macs, basically just some Trojans. I would try uninstalling or disabling it, and see if things improve. If you want to keep an AV program, your best bet would be to use ClamXav. It's known for its safety and compatibility with Macs.

    And, yes, verify the drive every time you do a hard shutdown.

    http://www.clamxav.com/download.php
    iMac G3/400 OS X 10.4.11, iMac 21.5" OS X 10.6.5
  • WZZZ Level 6 Level 6 (11,880 points)
    Currently Being Moderated
    Jan 27, 2011 5:57 AM (in response to B33-J4Y)
    Have you tried removing iAntiVirus? Also, have you tried creating a new user admin account from which to test this behavior. If it isn't happening there, you know it's something local to your regular account.

    Message was edited by: WZZZ
    iMac G3/400 OS X 10.4.11, iMac 21.5" OS X 10.6.5
  • WZZZ Level 6 Level 6 (11,880 points)
    Currently Being Moderated
    Jan 30, 2011 2:49 PM (in response to B33-J4Y)
    Did you ever get around to testing your RAM? Why don't you try Rember? It's a fairly rigorous test and doesn't take as long to run as the memory testing in the Apple Hardware Test (which you might also try running later to see if anything else might come up.) And, have you been verifying the disk after those hard shutdowns?

    Also, have you added any after-market RAM?

    http://www.kelleycomputing.net/rember/

    http://support.apple.com/kb/ht1509
    iMac G3/400 OS X 10.4.11, iMac 21.5" OS X 10.6.5
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