I have again retested the hard drive, processor, RAM and Video Ram by starting the iMac from an external hard drive and using a combination of the following packages: I waited an hour, forced a reboot, and ever since the iMac has returned to its original behaviour of not booting up – it would get past the progress bar and stay on the grey screen for a while before rebooting itself and starting the whole vicious cycle again. I then decided to initiate the mailbox rebuild, but as soon as I did the screen went black and stayed that way regardless of any keyboard shortcuts I tried using.
I then tested the iMac on and off for another day to ensure it had no problems booting up. This import took over 12hrs to do but seemed to work fine and Mail was displaying the emails. I knew this was inaccurate, but I decided to import the mailbox so I could do a mailbox rebuild to correct whatever corruption had taken place. The last mailbox was showing as being 270 GB in size. I did these one by one and six of them imported within minutes. On the fifth day I needed to manually import seven Apple Mail mailboxes. Migrated data from a Time Machine backup - successfulĪfter these steps I tested the iMac for four days with no issues in terms of booting up and using the computer.
Undertook an extensive hardware test using Apple Hardware Test (AHT 3A213) - passed.Starting up in OS X Recovery Mode via the internet – failed.Starting up in OS X Recovery Mode – failed.To address this I undertook the following troubleshooting steps: That is, it would commence booting up and cycle through the Apple logo and progress bar, but after the progress bar completed it would remain on the grey screen for a couple of minutes before rebooting itself and doing the same thing all over again. I was presented this iMac about 2 weeks ago as it refused to bootup. Successfully boot the iMac from an external drive and everything seems to work perfectly fine.In doing so everything seems to work perfectly fine. Start the iMac in Target Disk Mode and use it to successfully boot up other Macs.However, what makes this odd is that I can: It gets the Apple logo, gets past the progress bar, and then gets stuck on the grey screen for about two minutes before rebooting itself. I am seeking suggestions on what may be going in with an iMac I am currently troubleshooting, as it’s displaying behaviour I do not recall seeing before.
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