This machine does not boot.
All power rails are present and it is giving me a startup chime.
From there I get only a white screen and a fan running at high speed (no apple logo, no progress bar, no Displayport/HDMI output, can't hold Option to boot from alternate media, can't get to recovery) and sometimes I get just the SOS beep. I have been able to reset the SMC, but not the PRAM. Have disconnected the HDD and HDD cable with the hopes of getting at least a question mark folder, but still just a white screen.
I have removed a stick of RAM. I have removed the RAM completely (then I get a no RAM beep). I have tried one slot of the other. I have tried other RAM from another machine. Always either the white screen with no boot indicators, or sometimes the SOS 9 beeps.
I have read out the contents of the current ROM using a Raspberry Pi and flashrom, but I don't know enough about it's structure to tell if it is corrupted or not, but that is the theory that I am exploring now. I'd like to flash a clean rom to see if I can get some boot activity.
Side note: I have another working MacBook Pro mid-2010 but with the CS2 2.66Hz processor, running High Sierra, that I was going to dump the rom of, to try on the computer I'm having trouble with, but the eficheck --save - b rom.bin command is not working on that machine, so I can't get my own rom dump from that one. I get "ReadBinaryFromKernel: No Matching services found. Either this system is not supported by eficheck, or you need to re-load the kext." The same command and sequence of steps works on a 2012 Catalina Macbook, so there is something about the High Sierra 2010 Macbook install that isn't working. And I can't find many instances of the specific problem online. So if you can help me solve this problem, I can get at least get access to a (very close?) version of the ROM on my own to try.
So I am hoping someone can provide me a dump of for the MC374LL/A listed in the opening paragraph.
Thanks!
Last edit: 3 years 10 months ago by ja3robin. Reason: typo can --> can't
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