Skip navigation

Hi my new MacBook Air has started to run really slow with no reason to as well as the fan is very noisy for no reason. This started after I left the notebook on charge for a few hours. I have tried SMC reset with pushing shift/control/command

1684 Views 3 Replies Latest reply: Sep 21, 2013 8:53 AM by Linc Davis RSS
ChickyLula Calculating status...
Currently Being Moderated
Sep 10, 2013 5:10 PM

I have tried SMC reset with Shift/Control/Command left keys and Power button. It seemed to help the notebook run a little faster but not at its normal fast speed. Typing is really slow as there is a lag of the displayed letters.

The fan is running constantly at a noisy level.

There seems to be apps starting up even before I log in as the user - rainbow circle spinning - when I havn't started anything up.

 

Any Ideas?

 

Notebook only 3 months old out of box.

 

Thanks.

MacBook Air
  • Linc Davis Level 10 Level 10 (107,850 points)

    First, back up all data immediately, as your boot drive might be failing.

     

    There are a few other possible causes of generalized slow performance that you can rule out easily.

     

    • Reset the System Management Controller.
    • If you have many image or video files on the Desktop with preview icons, move them to another folder.
    • If applicable, uncheck all boxes in the iCloud preference pane.
    • Disconnect all non-essential wired peripherals and remove aftermarket expansion cards, if any.
    • Check your keychains in Keychain Access for excessively duplicated items.
    • Boot into Recovery mode, launch Disk Utility, and run Repair Disk.
    • If you're booting from an aftermarket SSD, see whether there's a firmware update for it.

     

    Otherwise, take the steps below when you notice the problem.

     

    Step 1

     

    Launch the Activity Monitor application in any of the following ways:

     

    ☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

     

    ☞ In the Finder, select Go Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

     

    ☞ Open LaunchPad. Click Utilities, then Activity Monitor in the icon grid.

     

    Select the CPU tab of the Activity Monitor window.

     

    Select All Processes from the menu in the toolbar, if not already selected.

     

    Click the heading of the % CPU column in the process table to sort the entries by CPU usage. You may have to click it twice to get the highest value at the top. What is it, and what is the process? Also post the values for % User, % System, and % Idle at the bottom of the window.

     

    Select the System Memory tab. What values are shown in the bottom part of the window for Page outs and Swap used?

     

    Next, select the Disk Activity tab. Post the approximate values shown for Reads in/sec and Writes out/sec (not Reads in and Writes out.)

     

    Step 2

     

    If you have more than one user account, you must be logged in as an administrator to carry out this step.

     

    Launch the Console application in the same way you launched Activity Monitor. Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select

    View Show Log List

    from the menu bar.

     

    Select the 50 or so most recent entries in the log. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V). You're looking for entries at the end of the log, not at the beginning.

     

    When posting a log extract, be selective. Don't post more than is requested.

    Please do not indiscriminately dump thousands of lines from the log into this discussion.

    Important: Some personal information, such as your name, may appear in the log. Anonymize before posting. That should be easy to do if your extract is not too long.

  • Linc Davis Level 10 Level 10 (107,850 points)

    The kernel is using excessive processor cycles. Below are some possible causes for the condition.

    Throttling

    When it gets high temperature readings from the hardware, or a low-voltage reading from the battery, the kernel may try to compensate by interrupting the processor(s) to slow them down and reduce power consumption. This condition can be due to

     

    • a buildup of dust on the logic board
    • high ambient temperature
    • a worn-out or faulty battery in a portable
    • the malfunction of a cooling fan or sensor

     

    Note that if the problem is caused by a sensor, there may be no actual overheating or undervoltage.

    If the computer is portable, test with and without the AC adapter connected. If kernel_task hogs the processor only on battery power, the fault is in the battery or the logic board. If it happens only on AC power, charging is causing the machine to heat up. That may be normal on some models. CPU usage should drop when charging is complete.

    The Apple Hardware Test or Apple Diagnostics, though not very reliable, is sometimes able to detect a bad fan or sensor.

    If nothing is wrong with the hardware, then whatever you can do to improve cooling may help.

    Installed software

    User-installed software that includes a device driver or other kernel code may thrash the kernel. That category includes virtualization software, such as Parallels and VMware, as well as most commercial "anti-virus" products. Some system-monitoring applications, such as "iStat," can also contribute to the problem. You can test for this possibility by completely disabling or removing the software according to the developer's instructions, or booting in safe mode. Note, however, that disabling a system modification without removing it or booting in safe mode may not be as easy as you think it is.

    Corrupt NVRAM or SMC data

    Sometimes the problem is cleared up by resetting the NVRAM or the SMC.

    External display

    Connecting an external LCD display to some MacBook Pro models may cause this issue. If applicable, test by disconnecting the display. You might get better results with a newer LED display.

Actions

More Like This

  • Retrieving data ...

Bookmarked By (0)

Legend

  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.