HT201464: Use Activity Monitor on your Mac

Learn about Use Activity Monitor on your Mac
johnfwhite

Q: I updated to OS X Yosemite a while back and now my Activity Monitor is not accessible - I have the wrong version.  What can I do to get it back?

I updated to OS X Yosemite a while back and now the Activity Monitor in my Utilities file is not useable. What do I need to do to acquire a useful version of Activity Monitor on my Macbook Pro 2008 version?

MacBook Pro, Other OS

Posted on Aug 18, 2015 1:53 PM

Close

Q: I updated to OS X Yosemite a while back and now my Activity Monitor is not accessible - I have the wrong version.  What can I ... more

  • All replies
  • Helpful answers

  • by Carolyn Samit,

    Carolyn Samit Carolyn Samit Aug 18, 2015 1:55 PM in response to johnfwhite
    Level 10 (120,143 points)
    Apple Watch
    Aug 18, 2015 1:55 PM in response to johnfwhite

    Restore OS X using OS X Recovery.

     

    That will reinstall the Activity Monitor app for you.

  • by Kappy,

    Kappy Kappy Aug 18, 2015 1:56 PM in response to johnfwhite
    Level 10 (270,222 points)
    Desktops
    Aug 18, 2015 1:56 PM in response to johnfwhite

    Reinstalling OS X Without Erasing the Drive

     

    Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears.

     

    Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.

     

    When the recovery menu appears select Disk Utility and press the Continue button. After Disk Utility loads select the indented Macintosh HD entry from the the left side list.  Click on the First Aid tab, then click on the Repair Disk button. If Disk Utility 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 Disk Utility and return to the main menu.

     

    Reinstall OS X: Select Reinstall OS X 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 and more reliable.

     

    Alternatively, see:

     

    Reinstall OS X Without Erasing the Drive

     

    Choose the version you have installed now:

     

    OS X Yosemite- Reinstall OS X

    OS X Mavericks- Reinstall OS X

    OS X Mountain Lion- Reinstall OS X

    OS X Lion- Reinstall Mac OS X

     

         Note: You will need an active Internet connection. I suggest using Ethernet

                     if possible because it is three times faster than wireless.