Pioneer A08XL Won't Read Discs

I just purchased a brand new A08XL and after installing it as Master and my other drive as slave, the drive burns great but will not read any discs. I’m thinking that it is a configuration problem. Any ideas? Thanks.

I figured out why my A08XL was not reading discs. The master/slave pin selectors were correctly set but the pioneer drive was on the top and my samsung cd-rw was on the bottom. I simply switched drive positions so the pioneer was on the bottom and the samsung on top. This made the pioneer the first drive connected to the ribbon cable. Now it’s working great.