Hi!
Bad luck with A2000s, huh? I once bought 2x Rev.4.4 B2000 machines, which were used in school from day one, so no one cared to check em. Both had very bad acid damages, managed to rescue one mobo with some jumper wires soldered and cpu + rom socket replaced.
But anyway, have you checked which Agnus version your mobo has and how it's RAM is configured? I mean these J101 and J500 ones? If you have Agnus P/N:8371 (PAL machine 512 Chip RAM version) and your motherboard configured to use extra 512k as Chip, it won't work. This was my "two cents" on your problem. Hope will work out well!
