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I have a (2012, I think) Mac mini.

After between 20 minutes and an hour of use it freezes, then goes to a black screen. Occasionally the freeze is preceded by graphics corruption, such as coloured squares.

A year ago, when the issue started, it would work for 2-4 hours before the same freeze and refusal to boot, so this problem is gradually becoming worse.

Removing the power cord, plugging it back in and switching it back on does not make it work. If I wait for some minutes or hours, it will boot again.

This makes me suspect some form of thermal issue, rather than software.

Is this a common fault on Mac minis? Is it fixable?

Is there a way to diagnose it? (I'm a Linux software developer - I'm not generally familiar with macOS).

  • What is the version of macOS running on your Mac mini? – Nimesh Neema Apr 8 at 7:48
  • @NimeshNeema I'll check this evening. – fadedbee Apr 8 at 7:51
  • Looks like a symptom of either simple overheat, or the GPU is dying. When was it last stripped & cleaned? – Tetsujin Apr 8 at 9:28
  • @Tetsujin It has never been stripped or cleaned, but it has only been used 2-4hrs/week. It is not noisy. – fadedbee Apr 8 at 9:31
  • That would still be my first port of call. You can build up a fair 'duvet' of dust-bunny on heatsinks in 1,000 hours, in the right [or wrong] environment. idk the minis too well, but on the Mac Pros, as soon as I can hear the fans at all, they get cleaned. – Tetsujin Apr 8 at 9:38

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