MacbookAir Mid-2009 Compatibility with Yosemite?

Ever since I upgraded this machine to 10.10.2 is has been unusably slow.  Activity Monitor shows that the kernel task can sometimes eat up over 80% of the CPU.  This was certainly never the case with 10.9.
I can't see to find anything specifically wrong with my system right now and all my software is essentially up to date.
So I'm thinking of going back to 10.9 but I don't know how to do it on this machine.  Would it simply be a matter of downloading Mavericks from the iTune Store?
Thanks in advance for the help.

It is compatible. Downgrading will require erasing the drive and restoring your old system from your backup. Or downloading a previous OS X installer. Mavericks is no longer available for download.
Try these in order testing your system after each to see if it's back to normal:
1. a. Resetting your Mac's PRAM and NVRAM
    b. Intel-based Macs: Resetting the System Management Controller (SMC)
2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the Utilities menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
4. Reinstall Yosemite: Reboot from the Recovery HD. Select Reinstall OS X from the Utilities menu, and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.
5. Reinstall Yosemite from Scratch:
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
How to Clean Install OS X Yosemite
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

Similar Messages

  • MacbookAir Mid 2009 Compatible with Yosemite?

    Ever since I upgraded this machine to 10.10.2 is has been unusably slow.  Activity Monitor shows that the kernel task can sometimes eat up over 80% of the CPU.  This was certainly never the case with 10.9.
    I can't see to find anything specifically wrong with my system right now and all my software is essentially up to date.
    So I'm thinking of going back to 10.9 but I don't know how to do it on this machine.  Would it simply be a matter of downloading Mavericks from the iTune Store?
    Thanks in advance for the help.

    It's compatible. To downgrade you would need to erase the drive, download the Mavericks installer (which you can't,) and reinstall Mavericks. See this:
    Try these in order testing your system after each to see if it's back to normal:
    1. a. Resetting your Mac's PRAM and NVRAM
        b. Intel-based Macs: Resetting the System Management Controller (SMC)
    2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:
    Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the Utilities menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
    3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities menu. Repair the Hard Drive and Permissions as follows.
    When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
    4. Reinstall Yosemite: Reboot from the Recovery HD. Select Reinstall OS X from the Utilities menu, and click on the Continue button.
    Note: You will need an active Internet connection. I suggest using Ethernet if possible
                because it is three times faster than wireless.
    5. Reinstall Yosemite from Scratch:
    Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
    How to Clean Install OS X Yosemite
    Note: You will need an active Internet connection. I suggest using Ethernet if possible
                because it is three times faster than wireless.

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    Panajev
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    Message was edited by: Panajev
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    nicegom
    Posts: 6
    Registered: Nov 12, 2009
    Re: Windows 7 x64, MacBook Pro, frequent CHKDSK after HDD firmware update
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    Cheer,
    Message was edited by: nicegom
    Macbook Air Windows Vista MBA of Mid 2009 with SSD

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    Just doublechecking. Does that include the recent chkdsk hotfixes?
    [The Chkdsk.exe program does not start correctly on a Windows 7-based computer|http://support.microsoft.com/kb/975778]

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