How serious are you about getting this baby up and running? I have three A4000 mainboards and an extra A3640 board on hand, but I am planning on eventually selling them on Ebay. I know that two of the boards are an older rev, and are missing some chips, but you could probably use the chips on your board to bring it to life.
If you want, I will provide some pictures of the boards and test them out to see if they boot OK. (I have some extra ROMS somewhere to test them out...)
Please feel free to PM me if you want me to pursue this. The chipless boards will be inexpensive, but I would ask more for the board with the chips still on it.
Thanks,
Douglas