Drive works fine, but on restart or after a required restart from app installation - the OS looks for CD in drive. Mac will not get to the login screen. It hangs and i can see a green light on dvd drive flashes every couple of seconds. If i shutdown, then start up - no issues. Drive is LG GH22LP21 - Mac Pro 10.7.5 2x2.66 Xenon
Master / Slave?
This is in the top bay? And nothing is in the bottom? There is probably a jumper to choose Master or Slave for the drive. If it is the only one, it should be Master.