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  1. #1

    Member Since
    Mar 18, 2009
    Melbourne, Australia
    OS-X Yosemite iMac, 4GB memory, 2.4 GHz Intel Processor
    OnyX and slow iMac
    I am running OSX 10.8.4 on my iMac. It has recently started running very slowly. Elsewhere I saw a recommendation to install OnyX. I downloaded it, but when I tried to install it, I received a message to the effect that this was not downloaded from the App Store and so my settings did not permit me to install it.
    Any suggestions as to whether it is worth installing OnyX - I realise that some say yes and some say no - and, if yes, how to get around the settings not allowing the installation.
    Also, any other suggestions please as to how to rejuvenate my iMac without formatting the hard disc and reinstalling the software from scratch?

  2. #2

    IWT's Avatar
    Member Since
    Jan 23, 2009
    Born in Scotland, Worked in Scotland then England, Now live in Wales
    2010 27" iMac 16GB RAM, SSD & 1TB IHD (Mavericks) + 2013 27" iMac Fusion SSD & 3TB IHD, 32GB (Maver
    This is quite in order. Apple adds an additional layer of security which simply advises you that you are downloading an app outside of the Apple App Store.

    OnyX is a great app and secure.

    So, go into System Preferences>Security & Privacy>General. Then check the box: "allow apps from anywhere"

    Now OnyX will run fine. Afterwards, it will continue to run, but if you are very security-concerned, you can always return to the Security & Privacy settings and re-check the "only allow from app store" if that's what you want.


  3. #3

    pigoo3's Avatar
    Member Since
    May 20, 2008
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.7.5
    Quote Originally Posted by pilgrim1936 View Post
    Any suggestions as to whether it is worth installing OnyX - I realise that some say yes and some say no...
    The overwhelming majority say "yes"...I'm not sure I can remember the last time I read someone familiar with Onyx say "no".

    So it's clearing not an "on the fence"...50/50...sort of decision.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

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