Normal startup?

Just got a new (refurbed) iMac last week.  I love. I have a few questions.

Startup is very fast with the Fusion drive.  But in the middle of the progress bar, the screen briefly flashes to black, then continues on.  It is also a light 'grinding' or his 'static', I hear very briefly.

In addition, there are times when I hear the sound that I work.  And sometimes, there is a short metallic 'ting' sound - almost as if the disc is in rotation or something.

Aren't really questions.  Just make sure that neither can be indicators of something more serious threat.

Thank you.

Hello

If your iMac with a built-in optical drive, it might be what you hear: Mac portable computers equipped with optical drives: noises from the optical drive - Apple Support

Please listen to the sample files.

Tags: Mac

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