I have a late 2012 iMac running El Capitan which has become quite sluggish. I’ve tried a few software solutions, but I think it’s something wrong with the disk. (A lot of stuff is fine; anything that touches the disk starts crawling.)
I tried to run the Apple Hardware Test using Apple’s instructions.
I booted my Mac while holding down the D key. I got the “Starting Internet Recovery” screen, then I was asked to select and authenticate with a Wi-Fi network. I did that, and it went back to the “Starting Internet Recovery” screen. Shortly afterward, it got stuck on an error:
I’ve tried Googling this code, but I can’t find anything on what it means – mostly just some Apple Discussion Forums with other people asking about it.
Anybody here know the answer?