Not sure if it's a common problem for those internal plastic tabs to break off during shipping, but I also had that happen to one of the units I purchased on eBay...I was able to get it working and get the CD/HD tray lined up correctly...

Not sure if it happened during shipping or if the previous user hosered it up...But I slapped in a 120GB drive on a removable caddy with the ribbon extension cable and I'm rippin' and burnin'.....Good luck,

Randy