so what i see from his words is that its not in the "My computer/ Computer" page.
Yes it true that it might be defect.
Please press on start button, right click on Computer then click manage. Click Device manager , open the CD/DVD rom like this :
http://i42.tinypic.com/2rw0tgi.png
See if there is any Optical drives in that list.
Post feedback and let us know. If printscreen included would be the best.