Startup Chimes with audio cable connected?

My Mini has started to sound it's healthy startup chime even when there is an audio cable connected to the audio/headphone output. The output works fine and sends audio to the speakers, but how can I mute the chime at startup?
Previously it always muted that sound with a cable connected and I believe it started chiming when I updated to 10.5.4.
TIA.

The mini generates the startup chime via the internal speakers regardless of whether external speakers are connected or not - the necessary support for the hardware audio port isn't loaded until after the power-on self test (which is what generates the chime) so in common with the iMac range, the chime comes from the internal speakers.
The only way to mute the chime at startup is to set the Sound preference pane to Mute (check the 'Mute' box in the Sound Effects tab). There are also some utilities such as Startup Sound (http://www5e.biglobe.ne.jp/~arcana/index.en.html) which variously succeed in muting the chime, though these tend to get broken with MacOS updates.

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