Hi, I have the exact same issue to the T that mister HAM has in this video:
https://www.youtube.com/watch?v=mfPXX081w9g&t=78s
It will only start up when I boot from the recovery disk, then I quickly CRL-C to stop the flash, then I warm boot and all is good.
When cold starting and opening up the software, no card is detected (using composite out)
monitor resolution saved to card is NTSC high res interlaced - VGA is 800x600
Any thoughts? I can work around the issue like Mr HAM did, but would like a better solution. Perhaps it is a timing issue, this computer does get held up when playing the Nexus7 demo in the middle.
MagicBox Alphagen:
Amiga A1200 Rev 2B
Apollo 1230 MK3 with 32mb ram. REMOVED FPU - fails to boot with it.