iMac not booting after upgrade to Yosemite
I have upgraded to Yosemite yesterday and since finishing off the installation with powering down I am unable to reboot the machine. It powers up with the music cord, then the boot bar to the bottom appears, but after about 5-8% of the bar the things shuts off - black screen. I've tried to start in Safe Mode - nothing. I've tried with cmd-v to check the boot protocol and at one point it shuts off. Any idea? HDD dead?
iMac, iOS 8.0.2