When I play an AGA demo I've downloaded from the net I usually only see the first few effects and then the graphics stop showing and I get only music. This repeats if I retry, stops at excactly the same place. So I'm wondering if it's me or the Access that is being an idiot.
If you bring up the early boot menu, what screenmode is it in? It it's ntsc, that'll be the problem.. Use something like degrader (or whatever util you prefer) to set the system to pal (or the early boot menu.)
Only thing I can think of..
