Jerky iMac

Discussion in 'iMac' started by Mark-Mac-Attack, Feb 22, 2008.

  1. Mark-Mac-Attack macrumors regular

    Joined:
    Apr 6, 2007
    Location:
    England
    #1
    Ok, not sure on this one, but its pissing me off!! :mad:

    Everything i do on the Mac is jerky, from the dock, to moving windows, to typing... checked the CPU usage, seems fine... like somethings throttling it... also had problems booting recently, gets stuck on the white screen..:confused:

    ideas fellas?
     
  2. aross99 macrumors 68000

    aross99

    Joined:
    Dec 17, 2006
    Location:
    East Lansing, MI
    #2
    First some questions...

    Which iMac to you have (G3, G4, G5, Intel?)?

    Which OS are you running (10.3 Panther, 10.4 Tiger, 10.5 Leopard)?

    How much Memory do you have?
     
  3. IgnatiusTheKing macrumors 68040

    IgnatiusTheKing

    Joined:
    Nov 17, 2007
    Location:
    das Fort
    #3
    Don't know about the booting problem, but the rest of it sounds like you need more RAM.
     
  4. Mark-Mac-Attack thread starter macrumors regular

    Joined:
    Apr 6, 2007
    Location:
    England
    #4
    doh, yes some details would help!!!!

    Alu iMac, 2GB RAM,

    Leopard.


    Anyway, should probably have restarted first, as this has cured the jerkyness...

    BUT

    this doesnt get past the fact that it sometimes fails to boot... PLUS during video/audio playback its been stuttering.... almost like a hard drive fault?
     
  5. aross99 macrumors 68000

    aross99

    Joined:
    Dec 17, 2006
    Location:
    East Lansing, MI
    #5
    If you are having hard drive issues, sometimes you can hear "odd" sounds from your drive - scraping sounds, slow repeating clicking, etc. These would be bad signs.

    You can also check the "SMART" status of your drive in Disk Utility. Launch Disk Utility and click on your hard drive. Look at the bottom of the window for: "S.M.A.R.T. Status". It should say "verified".

    Not sure that is your problem though. Disk issues usually come with significant error messages also...
     
  6. Mark-Mac-Attack thread starter macrumors regular

    Joined:
    Apr 6, 2007
    Location:
    England
    #6
    Hello again...

    Well the problem hasn't gone anywhere.

    I've removed the second memory module and the problem remains, playback etc. stutters every 5-10 minutes.. although its the whole system, playback of media is just what you notice...

    Really stuck...
     
  7. Muncher macrumors 65816

    Muncher

    Joined:
    Apr 19, 2007
    Location:
    California
    #7
    Couple of general fixes, which may or may not do anything:

    1. Reset PRAM, google that, you should find how to do it pretty easily.
    2. Repair Permissions. Can't see how this would help, but it can't hurt.
    3. Maybe your computer is overheating? Download smcFanControl, and turn up your fans to about 2000-2500 rpm each. Your computer will get a lot noisier, and that is considerably higher than default, so it should take care of overheating. (My fans are always set to 1500 rpm ODD, 1685 HDD, 1515 CPU)

    And, if you haven't already, download istat pro (widget). It will tell you important stuff concerning your computer.
     
  8. ewilson6 macrumors 6502

    Joined:
    Nov 30, 2006
    #8
    download latest leopard update, this will fix your video problem.

    ram is not the issue here.


    --Eric
     
  9. bluedoggiant macrumors 68030

    bluedoggiant

    Joined:
    Jul 13, 2007
    Location:
    MD & ATL,GA
    #9
    was it after the updates yesterday? My 2.8 was very unstable and unacceptable, jerky i guess, i restarted and its snappy again.
     
  10. Mark-Mac-Attack thread starter macrumors regular

    Joined:
    Apr 6, 2007
    Location:
    England
    #10
    No no, its been doing it for months,

    i've added the new updates last night, but havent been back on there today, will do so later and report back if the issue has gone.

    Cheers.
     
  11. GradientMac macrumors regular

    GradientMac

    Joined:
    Dec 5, 2007
    Location:
    Canada
    #11
    The problem with your video stuttering is something that has to do with iStat. Do you have it on? Turn it off and see if it still happens. I heard about this in a podcast but I can't remember which on it was.
     
  12. Mark-Mac-Attack thread starter macrumors regular

    Joined:
    Apr 6, 2007
    Location:
    England
  13. GradientMac macrumors regular

    GradientMac

    Joined:
    Dec 5, 2007
    Location:
    Canada
    #13
    It's an application that I figured you might have since it's been known to cause the problems.

    It goes in your menu bar and tells you stuff like processor usage and such.
     
  14. Mark-Mac-Attack thread starter macrumors regular

    Joined:
    Apr 6, 2007
    Location:
    England
    #14
    No, i don't have that, have very little on here that it didn't come with.

    I'm thinking of ringing applecare, as ive got it, (bargained it into the deal, for the sum of -40 quid!)
     

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