My 4,1's (flashed to 5,1 - boot rom 184.108.40.206) SuperDrive started acting up. Wouldn't open, etc., although it had been working fine. drutil status reported 'Media Is Busy'. I've since replaced the drive with an LG DVD writer and removed the bezel to enable it to fit correctly in the optical bay. The drive is working fine (confirmed on another machine) but on this 4,1 it will not eject from the eject menu or drutil and drutil still reports 'Media Is Busy'. Any specific pointers as to what could be confusing the machine? Thx, BD.