bios update?
was the motherboard actually repaired? or was it replaced with a board from a similar model? it's-possible those keys are not programmed into the bios on the current motherboard. an update to the latest bios version might fix this, but only if the mother board is the correct one.
i recently put a replacement motherboard into a dead roland pc 600. now it no longer reads the roland cartridge bar codes, but does read citizen printiva/seiko cartridge bar codes.
y