May 28, 2018 4:19PM PDT

A few minutes after startup from shutdown or from sleep mode my screen suddenly dims slightly. it also runs much slower then it has in the past.
The computer is 9 years old and running High Sierra 10.13.14

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That's pretty good.
May 28, 2018 4:28PM PDT
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Although your 2009 iMac is capable of running High Sierra,
May 29, 2018 4:42AM PDT

it is not a good experience.
That year really does not have the legs to carry off HS and you would be better off dropping down to Sierra, if possible.


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