My DVD Writer is not reading DVD's and CD's. What do it do?
DVD Writers or any Optical Drive like DVD Players, CD Drives should be regularly cleaned using Lens cleaning kit which you may find at this link http://bwindia.net/category/1/85/127
If it doesn't help, it is better to replace it with a New One as the Cost of Repair of an Optical Drive could be somewhat near the Cost of New Piece itself.
Find New DVD Writers here http://bwindia.net/category/1/2/72