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Does not boot in safe mode, does not go to recovery. Loads Apple all the way and then shuts off all the way and then tries again indefinitely. I tried known good bios (sourced from here in a previous thread) according to the software successfully, and 2 new batteries; the problem persists. The...

Thank you, I’ll revisit this thread when device arrives or something changes, Ima keep it alive because I will revisit it.

Just to be clear, there’s no way to do this with out a bios programming device of some sort correct? I am ordering one. If so in order to save time is it possible to use an EFI/firmware/bios chip from another identical model, which likely has a fine bios?

Unfortunately to hopefully provide all crucial data I have to quickly run it from the beginning :sleep: (I'll try and give only highlights): Came in from other shop for "only booting in safe mode" with a fresh install of Big Sur. I confirmed this issue with my eyes...

Is that a file I’d use with something like one of those EZP Programmer type doohickeys? Within the last month I stumbled across these on YouTube videos and have been doing research on them trying to decide which one I’m supposed to get. I am definitely ordering one I just want to be sure I’m...

If I reset the PRAM it will properly shut off booted to OS once. If you turn it back on the problem persists unless you reset the PRAM again.

Thank you, I've been waiting till I felt I have enough knowledge to benefit from this forum. I've worked in electronics for a long time but am fairly new at board level repair feel free to be as forward as necessary send me to learn stuff first etc., idc my feelings wont get hurt. I can't...

Everything I could think of software I've tried; I've tried all swappable parts. Every approach to turn computer off results in the same outcome. Screen goes off, fans keep spinning and it gets as hot as a metal slide on a bright Florida summer in 1993 up around the middle F-keys. There is...