I think of boot loops as a OS or Firmware failure which always fails consistently at the same place. Have you tried booting the system up using an external bootable drive yet? That is what I would do next to eliminate the internal Flash storage having issues.
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If you can get that far you should be able to [https://en.wikipedia.org/wiki/Grep#:~:text=grep%20is%20a%20command%2Dline,which%20has%20the%20same%20effect|Grep] the Crash file from the internal drive. The Kernel Panic logs can be found in "/Library/Logs/DiagnosticReports" folder and in the "Retired" sub folder of the internal drive.
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If you can get that far you should be able to [link|https://en.wikipedia.org/wiki/Grep#:~:text=grep%20is%20a%20command%2Dline,which%20has%20the%20same%20effect|Grep] the Crash file from the internal drive. The Kernel Panic logs can be found in "/Library/Logs/DiagnosticReports" folder and in the "Retired" sub folder of the internal drive.
See what it tells you. It will likely be large as it appends each event so just focus on the first few. Post a PDF file (landscape) here so we can look it over as well.
* [https://support.apple.com/en-us/101578|Create a bootable installer for macOS]
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* [https://developer.apple.com/documentation/xcode/analyzing-a-crash-report|Analyzing a crash report]
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Maybe you are facing a RAM issue. This system uses a denser SO-DIMM for its memory and the needed spec was hard for some companies to produce. I encountered lots of issues when the system was intro’d. Try removing one to see if that is stable and then swap them within the same slot. Next try the other slot (I don’t remember if there is a biased slot in this series).
* [link|https://support.apple.com/en-us/101578|Create a bootable installer for macOS]
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* [link|https://developer.apple.com/documentation/xcode/analyzing-a-crash-report|Analyzing a crash report]
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Maybe you are facing a RAM issue. This system uses a denser SO-DIMM for its memory and the needed spec was hard for some companies to produce. I encountered lots of issues when the system was intro’d. Try removing one to see if that is stable and then swap them within the same slot. Next try the other slot (I don’t remember if there is a biased slot in this series). If you have access to a known good set of RAM give that a try too.
I think of boot loops as a OS or Firmware failure which always fails consistently at the same place. Have you tried booting the system up using an external bootable drive yet? That is what I would do next to eliminate the internal Flash storage having issues.
If you can get that far you should be able to [https://en.wikipedia.org/wiki/Grep#:~:text=grep%20is%20a%20command%2Dline,which%20has%20the%20same%20effect|Grep] the Crash file from the internal drive. The Kernel Panic logs can be found in "/Library/Logs/DiagnosticReports" folder and in the "Retired" sub folder of the internal drive.
See what it tells you. It will likely be large as it appends each event so just focus on the first few. Post a PDF file (landscape) here so we can look it over as well.
***Reference***:
* [https://support.apple.com/en-us/102603|Mac startup key combinations]
* [https://support.apple.com/en-us/101578|Create a bootable installer for macOS]
* [https://developer.apple.com/documentation/xcode/analyzing-a-crash-report|Analyzing a crash report]
Maybe you are facing a RAM issue. This system uses a denser SO-DIMM for its memory and the needed spec was hard for some companies to produce. I encountered lots of issues when the system was intro’d. Try removing one to see if that is stable and then swap them within the same slot. Next try the other slot (I don’t remember if there is a biased slot in this series).