It could be the Rom update in BB2.
Try booting with a floppy disk, and using a text editor to amend the startup sequence to add "SKIPROMUPDATES" to the setpatch line.
eg setpatch SKIPROMUPDATES
From the readme:
We cannot guarantee that the ROM Update works properly on each hardware and software configuration that can run AmigaOS 3.9 with Boing Bag 3.9-2. Thus we have only provided limited warranty and limited support for the ROM Update: If it doesn't run on your system, please use the ROM Update supplied on the AmigaOS 3.9 CD or do not use the ROM Update at all. You might also try skipping certain parts of the ROM Update by using @{"SetPatch SKIPROMUPDATES" link skipromupdates}. Amiga Inc. and HAAGE&PARTNER are not obligated to ensure that the ROM Update works on your system.
