James Rydings

Q: Mac won't boot

My iMac started acting oddly, at first it wouldn't wake up when it went to sleep. It then started not booting anymore. It freezes up on the grey screen with the apple logo, after the circle things spins around for a while. I tried repairing disk permission, repairing disk, reset pram, ran fsck -y in Single User mode, and ran hard drive and data integrity checks with Drive Genius. No issues found. I can however boot just fine in Safe Mode, although the screen/graphics seems kinda slow and laggy, and I can boot the Recovery drive.

I then tried reinstalling the OS. My OS disks and thumb drives will not boot. I didn't want to install past Mountain Lion, however the only way I could get it to install a new OS was booting the recovery drive and download and install Mavericks. It installed no problem, but again will not boot only in safe mode.

Are there some logs that might be able to tell me what the problem is?

iMac, Mac OS X (10.7.5), 3.06 ghz, 4gb, 512mb

Posted on Jun 26, 2016 12:09 PM

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Q: Mac won't boot

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  • by cdhw,

    cdhw cdhw Jul 3, 2016 4:45 AM in response to James Rydings
    Level 4 (2,668 points)
    Servers Enterprise
    Jul 3, 2016 4:45 AM in response to James Rydings

    Nothing in the log strikes me as remarkable, other than it ends abruptly for no obvious reason.

     

    If you have performed a clean install of the OS X reset the NVRAM and SMC and the problem remains then I suspect a hardware problem. Safe Mode disables the GPU and that would be my best guess. This is also consistent with the problem just appearing one day for no obvious reason, as opposed to after a system update or installation of new software, and the Apple Hardware Test failing to run.

     

    Your next move is a Genius Appointment at your nearest Apple Store. They have better facilities and tools for hardware diagnostics than end-users have access to.

     

    C.

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