have to admit not to now how the amiga A 2000 boot Priority works..
so the only thing I can suggest is to remove all boot drives "Disconnect them "
Attach CF card and interface to IDE connector on the vampire card , assuming you have one set up ,
and see if it boots .
sorry I can not help further.
with no boot Devices connected you You should see this boot screen." scart output"amiga rgb"
You can see the Apollo team logo under the amiga tick
so you know you are using Apollo boot rom .
hdmi out put will show this screen for a few seconds on boot.
All amiga Native screen resolutions are Displayed through amiga rgb port .
All other screen resolutions are Displayed through hdmi but not at the same time.
but I think this will change in the Future releases of the Apollo core
hope this will help