Boxster (auto) won't go into drive or gear... Suggestions?

[aftabulis]

So we're diagnosing a Boxster that won't go into any gear but park (automatic transmission). I flushed some heavily used transmission fluid, oil, and change the filter... then checked the shifter cable, which is not cracked or damaged, the cable is able to push and pull the arm on the side of the transmission, so I don't think there is any issue there.... Anyone ever hear of a computer issue or a simple or common problem with these transmissions that would prevent them from going into gear?

Thanks for anything possible solutions you can think of,

Adam