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  1. #1


    Member Since
    Apr 10, 2012
    Location
    Scotland
    Posts
    6
    Specs:
    27" iMac, 2.7GHz i5, 4GB, Lion, iPhone 4s, iPad, iPod
    Strange behaviour at startup
    Hi,
    I'm relatively new to Macs and so looking for some help to resolve my issue.
    I have the following mac;
    27-inch, Mid 2011Processor
    2.7 GHz Intel Core i5
    Memory 4 GB 1333 MHz DDR3
    Graphics AMD Radeon HD 6770M 512 MB
    Software Mac OS X Lion 10.7.3 (11D50b)

    Over the last 2-3 week period when I boot up my mac from cold, it takes around 2 minutes to get to login screen and then once logged in the screen update speed is very slow.
    If i go into launchpad and scroll between pages, the screen updates like a set of blinds upwards and is very unresponsive.
    If I restart the mac then everything is fine but i don't understand why this is happening and it is really inconvenient to have to effective boot the mac twice each time i want to use it.

    I have tried the Apple hardware check which has returned no problems and have also repaired all permissions in an attempt to fix, however the issue still persists.

    Any advice would be greatly appreciated.

    thanks

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    47,121
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, El Capitan
    The next time you boot from a cold start, instead of rebooting, open your Activity Monitor app (Applications, Utilities, Activity Monitor.app) and look carefully to see if there is an unusual amount of activity going on. Look for heavy CPU and memory usage. If you find any, write down what's causing it and post back.

  3. #3


    Member Since
    Apr 10, 2012
    Location
    Scotland
    Posts
    6
    Specs:
    27" iMac, 2.7GHz i5, 4GB, Lion, iPhone 4s, iPad, iPod
    Hi chscag,
    what sort of figures are we talking about when you refer to heavy CPU and memory usage ?

  4. #4

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    47,121
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, El Capitan
    Two columns which are important:

    %CPU

    Real Memory

    You can glance down both of those columns and get an idea of what you need to keep an eye out on. Percentage of CPU usages that are large (~50% or more), and heavy memory usage.

  5. #5

    vansmith's Avatar
    Member Since
    Oct 19, 2008
    Location
    Toronto
    Posts
    19,742
    Specs:
    2012 13" MBP (2.5 i5, 8GB)
    You can sort the columns by clicking the respective column titles. That should help in determining what might be causing you some problems.
    Important Links: Community Guidelines : Use the reputation system if you've been helped.
    M-F Blog :: Write for the blog
    Writing a Quality Post

  6. #6

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    21,199
    Specs:
    27" 5K iMac, 3.3GHz, 256GB Flash Storge, 16GB memory and OS X.11.3.
    Anything set up in Login items?
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  7. #7


    Member Since
    Apr 10, 2012
    Location
    Scotland
    Posts
    6
    Specs:
    27" iMac, 2.7GHz i5, 4GB, Lion, iPhone 4s, iPad, iPod
    Ive just booted from cold again this morning to the same problem, the issue seems to be with applications.
    When i click on launchpad it takes ages to appear and the screen continually refreshes itself from bottom to top in bars.

    Once i eventually got into activity monitor there was nothing that stuck out other than something called kernal_task that was using 241.4mb of memory.
    I then tried to open launchpad again with the monitor open which took ages again and spotted PEDcache using 100% cpu for a short period of time.

    I repeated this a few times but couldn't get the PEDcache to show in the monitor again, despite the problem still presenting itself.

    Any ideas ??

  8. #8


    Member Since
    Mar 13, 2011
    Posts
    224
    Specs:
    2011 MacBook Air, i5 27" IMac, 2010 21.5" IMac, 2010 Mini, 2011 13" MBP, IPhone 4, Airport Extreme
    Try using disk utility to repair permissions on your HDD.

  9. #9


    Member Since
    Apr 10, 2012
    Location
    Scotland
    Posts
    6
    Specs:
    27" iMac, 2.7GHz i5, 4GB, Lion, iPhone 4s, iPad, iPod
    Quote Originally Posted by Mini_mi View Post
    Try using disk utility to repair permissions on your HDD.
    Hi,
    I've tried that already but made no difference.

  10. #10


    Member Since
    Apr 10, 2012
    Location
    Scotland
    Posts
    6
    Specs:
    27" iMac, 2.7GHz i5, 4GB, Lion, iPhone 4s, iPad, iPod
    The other thing I have noticed is that on the occasions this happens, there is a progress bar on the white bootup screen along with the Apple logo and usual spinning circle.
    This progress bar doesn't appear when I reboot or the occasions that I don't see the issue.

  11. #11


    Member Since
    Dec 11, 2010
    Posts
    1,418
    Try repairing the hard drive (not permissions). Use one of these three methods:
    Resolve startup issues and perform disk maintenance with Disk Utility and fsck (it's an older guide)

    or, with Lion, use command-r immediately after startup gong sound to boot the recovery partition, then use Disk Utility to repair the normal startup drive.

  12. #12


    Member Since
    Apr 10, 2012
    Location
    Scotland
    Posts
    6
    Specs:
    27" iMac, 2.7GHz i5, 4GB, Lion, iPhone 4s, iPad, iPod
    Having done a bit more research on the issue it appears to be a fairly common issue and a bug within Lion which occurs if wireless keyboard and mouse are turned on prior to switching iMac on !!

    See link to Apple support
    https://discussions.apple.com/thread...rt=15&tstart=0

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