iMac 2009 corrupt HD after update!!!
Hello guys. I just tried to update my old 2009 iMac (was running 10.6.8) to High Sierra, but the update failed in many ways. So I made myself a bootable USB where I can install High Sierra from. So I partitioned the Macintosh HD and installed High Sierra on the free partition. Then, suddenly, with about two minutes remaining in the installer on the bootable USB, the mac shut down unexpectedly. It restarted and said "Your Mac shut down because of a problem" or something the sort. Now, when I start it up, it shows a High Sierra style apple logo and loading bar, but then the screen goes black, the Macintosh HD makes weird noises, and the same process happens over and over again until it tells me my mac shut down because of a problem. I booted in verbose mode, and it tells me that the mac is booting after panic. I cannot access recovery and when I press OPTION to select bootable disk and boot from the USB the Mac logo is replaced with a circle and a line through it.
Help would be very appreciated!
I'm fine with erasing my disk and getting back to 10.6.8 or High Sierra. The computer just has to work again.
Thank you so much!
iMac Line (2012 and Later)