Hi Alan,
> On 24 Nov 2014, at 4:35 pm, Alan Smith <sma...@iinet.net.au> wrote:
> 
> iMac subsequently started up OK.  Some “irregularities” noted for future 
> investigation, including no startup Chime;

Check your System Sound is not 'Muted' or turned down too low
System Preferences > Sound - Output
Output volume: Check that 'Mute' is not ticked.

Cheers,
Ronni

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