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If you are sure the CD's you are using are not scratched, it could be the lens. There is a CD lens Cleaner you can purchase at any store. Just put it in the CD Player and it will go through the cleaning process.
Hope this helps, If you need anything else please feel free to ask. If you found this helpful don’t forget to click the *accept* button!
You don't mention how long it read 2 of the 3 prior to reading none. It still could be that it needs to be cleaned or that the lens is not lined up.
When you first insert a disc cleaner it will spin (Unless you are saying your player is not even spinning) once it spins it will start to clean the lens. If it's not even spinning then it's not picking up the disc and the lens is out of line.
Hope this helps, let me know if you have any further questions.