To all you guys out there with a dead DVD drive.
I recently bought HD1BT off ebay with a faulty DVD drive (disc stuck & dead spindle motor). So I opened it up & found someone had been there before me (stripped & missing screws).
Anyway all was not lost, it turns out that the DVD drive is the same unit as found in the X1/N1 series, but there is a difference in/on the drives chipset/firmware. So its a case of swapping over the circuit boards & hey presto everything is back up running.