I think there is a jumper on the motherboard to set the A2000 for two floppies, or one. Make sure it's set for one.
Oh, and is there any floppy drive installed at all? If none, it may take a super long time to get to the insert disk screen (if ever). Can't remember precisely. If no floppy drive at all, try installing one (and make sure it is properly set up as DF0: not DF1: - cable twist). This is also a good idea just in case you have a bad floppy drive that is locking up the boot process.
Jumper J301: floppies have this ID circuitry on board, but as it's not an industry standard capability, it has to be implemented on the A2000 motherboard to save cost on internal drives. Leaving the jumper open prevents the Amiga from seeing the ID sequence.
