Boot up fails and slow on iMac

  belayer 19:41 18 Jun 2019

My 2015 iMac, Retina with i5 processor is running Mojave. Every time I switch it on it crashes just over half way through initial boot up. After 10 - 15 minutes waiting I turn off the power and switch on again and after about 4 or 5 minutes it boots up, but with a very 'interrupted' boot up process.

Any suggestions what I can do?

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