Carol basicly copy the one thats in all ready in unless your going to have two cd drives the you will have to make one the master and the other the slave you do this by changeing the jumpers on the back of the cd drive it's easy to do.

4 screws (2 each side)
1 ribbon (big flat cable that comes out of the back)
1 audio connection
1 power lead

All the things above can only put in one way so you can not go wrong.

thanks Marie The old one is broken so it will just be replaced with the new one.