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I bought a Mac Mini mid 2011 and sometimes i have an hard reboot. I thought it was a power problem and I replaced it but nothing seems to have changed.

If i execute log show --predicate 'eventMessage contains "Previous shutdown cause"' --last 1h the result is kernel: (AppleSMC) Previous shutdown cause: -128

I searched online but i cannot find anything.

Any suggestion?

user2098675
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    https://georgegarside.com/blog/macos/shutdown-causes/ says it's a memory issue. Try running AHT, press & hold D at boot, run the short & full tests [may take a long time] & let us know what it reports. Also, if you see errors or crashes, test by stripping all except one RAM stick & repeat with a different stick until you find which is failing. – Tetsujin Jun 01 '20 at 18:02
  • I had also seen that page, but on some sites I also found that it was related to the GPU. I have to try a couple of banks that I have aside. I tried to start the AHT but it doesn't seem to start. Could it be because Catalina is there? – user2098675 Jun 01 '20 at 18:12
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    Catalina shouldn't be the issue on an older Mac without a T chip. Maybe see https://osxdaily.com/2016/06/25/how-to-use-apple-hardware-test-to-diagnose-mac-problems/ for more info. – Tetsujin Jun 01 '20 at 18:16
  • I tried to run AHT but it restarted during the tests – user2098675 Jun 04 '20 at 10:49
  • Ram checked, usb checked (i need to try with bluetooth keyboard), thermal paste replaced but the result is the same: reboot and shutdown cause -128. Sometimes after this reboot the screen still black and the fan is loudly – user2098675 Jun 04 '20 at 20:25
  • could it be the fan that is shorting? I read a little online that sometimes the temperature sensor is in the fan – user2098675 Jun 05 '20 at 10:20

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