Pioneer DVR-105 Wont Read DVDs!

I have a Pioneer DVR-105 which I am having trouble with. It can read and write CDs but when I insert any DVD disc, it can’t read it. It says “Please insert a disc into drive” when I click on the icon in “My Computer”. I have some backup copy of games which I need to burn on to some DVDs but this is holding me back. I have looked at almost every thread but still haven’t found a way to fix this problem. Can I get some help!