I successfully replaced the DVD Read Only-CD RW drive in my Mid 2006 Macbook, with a DVD R-RW DL/CD-R-RW drive, without any trouble, by following these instructions, step by step. What helped me is for every step of the teardown/re-assembly I numbered some 1/2 cup yogurt containers from #1 to #8, cleaned of course, and placed all the screws removed in that step in a separately numbered cup making the re-assembly a breeze. It took me about 2 1/2 hours but the result was perfect!

I had this problem as well, caused by a small cable coming from the display. It is a Sync Cable with a small 2 Pin Molex connector, and it popped up and got hidden when I removed the display, which caused me to forget to re-attach it during reassembly.

In step 5 suggestion, muffin pan for parts, I used 500Ml (1 cup) yogurt containers, about 10 of them and numbered each one with the corresponding dis-assembly/re-assembly step, and my replacement of the CD RW-DVD-Rom to a DVD R-RW DL/CD RW drive in my Macbook went without a hitch. It took me about 2 hours, with breaks, and I also used a Magnifier Lamp along with approved, magnetic tip screwdriver bits, which made the whole thing a lot easier.

My batteries leaked inside and to remove them I had to open the screw cap on the battery compartment and sharply hit the trackpad edge on the edge of a table (Preferably wood) with the compartment facing down. The batteries eventually came out and to clean ouit the residue, acid, white crud, I used the handyman's secret weapon, WD40. It works great now !