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We were camping, I was trying to pull up a movie and it froze. It was completely unresponsive, I didn't see the kernel panic message but I forced a restart by holding down the power button. On booting again, it went straight to the "prohibitory symbol." I forced another restart, and since then, the screen has just been grey. No Apple logo, nothing. After 30-45 minutes, I get the flashing question mark folder.

I have reset the SMC and NVRAM. Resetting the NVRAM seems to work, it does the startup chime, the screen flashes, and then shortly after it chimes again. It didn't help.

I can't boot into recovery ⌘ CommandR., Internet recovery ⌘ Command⌥ OptionR, or diagnostics D. Safe mode ⇧ Shift and single-user mode ⌘ Commands didn't work either.

I have tried booting off of a Lubuntu flash drive ⌥ Option and a SliTaz live CD via a USB CD drive C; neither of those did anything either. If I leave it for a while, the flash drive will start blinking and the CD spins up, but the computer is still grey and unresponsive. I have a Mac at work, so I might try creating a bootable flash drive from that once I go back.

I've ordered one of their cursed pentalobe screwdrivers; does anyone know if this machine has diagnostic LEDs like the older iMacs? I'm thinking it's definitely a hardware issue at this point but I don't know how to move forward, I figure I can at least recover the SSD.

Thanks in advance, let me know if you need any other details. I haven't seen anything like this before.

I think it was running 10.8 or 10.9 but I don't know for sure, I haven't really used it in a couple years. Model is A1466, EMC 2632.

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... does anyone know if this machine has diagnostic LEDs like the older iMacs?

There are no diagnostic LEDs on the logic board.

I'm thinking it's definitely a hardware issue at this point but I don't know how to move forward, I figure I can at least recover the SSD.

This is a big jump in determination when two very conspicuous clues were presented:

Now, I'm not ruling out hardware - it's entirely possible your drive has failed. But breaking out the screwdriver prior to doing any sort of diagnostics or even examining the symptoms a bit more is putting the cart before the horse. You can run Apple Diagnostics by holding D while booting from a powered off state.

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  • I tried running Apple Diagnostics, nothing. On AC power and on battery. Option-D to start it over the Internet doesn't work either. – Ella Aug 9 '20 at 17:29
  • Shift Cmd Opt R. If you can’t boot that, it’s your logic board – Allan Aug 9 '20 at 17:32
  • That didn't work either. Guess it's the logic board, thanks for your help. – Ella Aug 9 '20 at 17:38

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