It may just be the DVD part that is not working. I once had a DVD drive that would read CD's but not DVD's. I also once had a DVD drive that would install 2003 (CD) and Server 2008 (DVD) just fine, but would not install 2008 R2 (DVD). Seems bizarre as it seems to work otherwise, but it is possible. The amount of use on the drive is less important, as it could be a failure not related to wear and tear. Besides, if this drive has only ever been used to install CentOS, then we may not be sure the drive ever read DVD's - could have been DOA.