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.