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most sony CD and DVD players have a digital signature design to play CDs and DVDs that are original and licensed. some CDs or DVDs dont work since the player does not recognize or scan any digital signature embedded in the CD or a DVD. 2nd, lens problem causes most players not to read CDs nor DVDs. you can try to buy CD or DVD lens cleaners to have your lens cleaned.
This is a common issue with NEC DVD burners, assuming that your NEC DVD burner cannot read and write DVDs anymore. I had a similar issue with my NEC DVD burner, which couldn't read and write CDs, but DVDs successfully. This is usually due to wear and tear of constant usage of the drive itself and sometimes mechanisms inside the DVD burner cease to work. While Windows Troubleshooting, uninstalling and re-installing the drive are suggestable, I am afraid the only option is a complete DVD burner replacement.
This is a common problem I have seen over the years it appears that the Laser for the CD, burns out, or the detector for the CD side of things fails..either way it usually results in DVD working 100% BUT the CD side if things is no good... Unfortuanatly it means ya gonna have to get another unit :(