Q: 27" iMac randomly reboots
Hi there, apologies for the doubling up but somehow my initial post got screwed up and the title of the discussion did not indicate the problem. I can't seem to delete the initial thread.
Twice in the last two weeks my Mac has suddenly and unexpectedly rebooted whilst I have been working on it. The first time I wasn't sure it actually happened as I had turned away for a moment and looked back at the screen just in time to see the screen "jump" back into place. There wasn't even the reboot sound.
Over the weekend, again, it did the same thing only this time I had just plugged out the power-cord to an unmounted 1TB WD when simultaneously the iMac screen went grey, then rebooted (and seem to do it twice) before reappearing.
Every time I start up I get a message saying "This Hard Drive is unrecognisable" yet all three externals mount, and I keep getting notifications throughout the day that the 4TB Seagate external (that holds my iTunes library) should be unmounted before disconnection but it is <mostly> always connected. Sometimes, when I startup iTunes I realise that the external isn't mounted for some reason (hence the forced power-plug manoeuvre - is there anyway of internally remounting a drive without restarting or unplugging the power of the device?).
So, in a nutshell, I keep getting external HD mount/unmount notifications and the one time I did unplug one in order for it to remount, the iMac freaked out with a reboot/kernal panic.
Anyone else suffering something similar?
27" iMac (late 2012) Yosemite 10.10.1, 32GB Ram, 1TB WD Firewire, 4TB Seagate, 750GB WD Elements (Time Machine).
iMac, Mac OS X (10.4.11)
Posted on Nov 23, 2014 6:19 PM

