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Have a look in the guide, chapter 2 IIRC.
You should be able to pass settings to kernel before downloading it, just choose a suitable boot line like
Icaros Desktop (Legacy 800x600 resolution)
and press E. Then have a look into this setting
and kill the @60 part, maybe this is forcing AROS to a video frequency your monitor does not support. To continue booting, press Ctrl+X.