Replaced Macbook optical drive - Now problem

[Mr.Gadget]

OK, I replaced the optical drive in my wife's Macbook (2GHZ, Core Duo). The process went remarkably well, but when all was put together and powered back on, the drive made a sound as if it were accepting a disc. The drive is empty though and when I try to insert a disc, the drive bay is blocked.
Is my drive bad or is this something that happens sometimes when a new drive is installed?

Thanks!

Oh yes, OS X 10.1.10 detects the drive and identifies it just fine.

 

[iToaster]

You did use the right hight of drive, right? Open it and see, you might just need to push it down a little. Try poking a CD in there and see what's happening in there.