I recently changed a screen on a Ti Powerbook. After putting everything back the display works fine but it won't detect the Airport card. (It worked before I removed the logic board) and I've inserted a DVD and it doesn't seem to recognise my CD/DVD drive. I've tried the eject button and nothing (not even the eject icon on screen) and when I go into DVDPlayer to try and eject from there I get a message saying "There was an initialization error, A valid DVD drive could not be found [-70012] Any ideas? This drive has always worked perfect. I've check all the cables for the Airport and Optical Drive and they seem fine.