Way to get me off my tired backside. I haven't been running the system I described, so I dug it out.
When powering the GVP without an A500, the HD spins up but the HD activity light barely flickers. This happens with an unformatted 2.1 Gig Quantum Fireball. Top switch is set to "AutoBoot".
With the GVP & A500 connected (I powered the GVP first), the activity LED flashes a few seconds and then the screen requests a boot disk.
I loaded the GVP Install disk and ran FastPrep. It let me custom-size five partitions. I like to set up a couple 100 MB boot partitions to run different versions of the OS. (I usually will Not allow any to be named "Work:" because many install scripts make bad assumptions about this.)
I installed OS 2.05 (couldn't find OS 2.1) with the FastPrep utility. Fast prep asks if you want to copy disks to each partition as soon as they are formatted. Upon reset, the system booted from the HD. All is good.
Note: my HD didn't show until I formatted it with FastPrep.