Hi folks,

My iMac is a December 2012 model 21.5 inch with i7 processor.
I am using the latest macOS Sierra.

During the past 2 weeks it has frozen about 80 percent through the startup bar.
I have had to hold the power button till it shuts down.
Then restart …. each time with success.

Any ideas why this may be happening and how to fix it please ?

Regards,
Stephen Chape






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