This may (or may not) help:
I have an A3640 in my A3000 and was never able to get my GVP Spectrum card working until I updated all three chips: Buster, DMAC, and Ramsey. If you have an accelerator card, try removing it. My Specturm would work without the A3640. And I'd suggest the DMAC and Ramsey updates if are able to get them.
:-D
