I recently installed a Pioneer Blu Ray drive (BDC-207DBK) to replace the original Pioneer combo drive that came in this Mac, which no longer works. To install it, I needed to use a SATA cable to connect it to one of the two SATA ports on the motherboard. The drive physically works fine after every reboot. However, after I leave the Mac for a while and come back the following happens when I want to insert DVD: I know from my previous use that the drive has no DVD in it. I press eject, but instead of ejecting I get the popup that indicates I've inserted a blank CD. I choose Ignore. I open disk utility and see that the drive itself is no longer mounted. From this point, every press of eject opens the popup. No action I've tried at this point will mount the drive or eject its DVD tray- that is, until I reboot. Then, everything works fine until I leave it for a while and come back. I would think this is a software problem because it functions fine as long as I stay at the machine after reboot. The Mac's firmware seems to be up to date. I've tried zapping the PRAM a few times, but no change. Anyone else had this issue and know how to solve it? Thanks!