ok, i'm digging back into brain cells i lost long ago, but i had a cube with an iomega external burner that would not burn via an early version of itunes.
i was running 9.2.2 but the problem was itunes. version 1 did not support many, if any, external burners.
let me ask you this, have you ever burned with itunes on this setup?
i think you may need to upgrade the itunes.
lgb