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Thread: Restart problem

  1. #1
    Restart problem
    Several months ago, my Mac Pro 1,1 stopped being able to re-awaken from sleep without going into a full reboot. Strangely, this problem went away after I bought new RAM to replace the original that had failed. But now it has a different problem: Re-start doesn't work. The computer will shut down, but during restart all it does is check the optical drive (audible sound) several times and hang. I have to force a shut down (power button) and cold boot.

    Any thoughts?

  2. #2
    Restart problem
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    Your Mac's Specs
    iMac, i7 4GHz, 32GB memory, 1TB Blade Drive, macOS X.15.3,.
    Rep Power
    Sounds like you may have a questionable power supply.
    Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  3. #3
    Restart problem
    lclev's Avatar
    Member Since
    Jul 24, 2013
    Ohio (USA)
    Your Mac's Specs
    2017 13" MBPro, 2010 MacPro, iPhone Xs Max
    Rep Power
    First - have you tried resetting the SMC and PRAM?

    PRAM reset (Cmd+Opt+P+R at startup and hold until two boot chimes have sounded)

    SMC reset -- Unplug for 15 seconds, plugging back in and waiting 5 seconds before starting up

    My next thought is that this is an older mac and it's parts may be starting to fail. This is a 2006-2008 vintage computer. It might be some component is having to be charged or warmed up to start booting. Is there is an on-board battery that could need replacing? I am not sure on that one. Power Supply could be failing too.

    I did read in another forum where upgrading the EFI to 2.1 fixed a similar (but not identical) problem. Interesting read though.

    Recommend using Onyx to clean your Mac.
    If you have been helped, please add to their reputation by clicking on the icon in the lower left hand corner of the post.

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