First, let me say that I am a newbie. I have a Sony Vaio with XPMCE. I have tried to replace an existing broken dvd writer with a new one. I tried first setting it up as a master, just as the first unit had been-my computer would not even boot. I then changed it to a slave, and Windows came back on. However, the computer does not recognize the drive-what the heck do I do now??