Mac pro running OS 10.6 I decided to install a second internal dvd drive that i had purchased last year- I removed the dvd bay removed the door from the new dvd player installed it into the bottom slot of the bay. I plugged both power cords in with the one labeled top on thje top player and did the same with the ribbon cable fired the machine back up and hit the key to open the bay nothing happened i then launched the dvd program and received this message There was an initialization error a valid drive could not be found (-70012). Any help would truley be appriciated Thank you