Trying to wipe and reinstall a mac I picked up from a closing school, stuck in restart loop.

Since the Art Institutes are closing I was able to pick up a free iMac a1312 2429. Nothing great, just something a co-worker could give to his wife for her birthday. Problem is that the Art Institute didn't wipe is before handing it off, no big surprise the closure was a little sudden. Luckily, they don't have filevault installed or a root password so I figured it'd be easy to boot to single user mode create an admin account, then a bootable thumb drive, and do a clean install.

Since it was running El Capitan, so I thought I'd be able to skip a couple steps and download the hackitosh El Capitan installation .dmg, used transmac to create a boot image, and get started. Unfortunately while I can select the thumb drive, if I try to boot to it, it throws and error too quickly to read, then restarts.

So I booted to command line checked drive integrity, mounted the start-up drive, and deleted .AppleSetupDone. And now it just keeps rebooting instead of going to a network login screen.

Even trying to boot into recovery it throws and error then immediately reboots.

I can still boot to command line, and occasionally it will throw up the Art Institute's splash screen where it would ask for a network login, but if I try the command /sbin/mount No change from trying to boot to the El Capitan image either.

I imagine I'm probably going to have to do what AI's I.T. needed to do, and pull out the HDD, replace it, and try, but I'm worried because I can't boot to the El Capitan installation image, so I was hoping someone here would have some advice and what I can do, or how to move forward.

submitted by /u/Nihtgalan
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