Solution Sony CDX-S2050 CD player error

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just a question i have a Sony CDX-S2050 CD player in my car and it will not play cd-r/rw cd's any help would be appreciated. As i backup most of my music cd's for in my car so my original copies dont get scratched/lost i have noticed that only some of my backup copies will play but 4 out 5 of them will not , any help with me solving this issue would be appreciated , as i already have run a laser cleaner through the player. and know and have read all the specifications that it is able to play cd-r/rw cd's but its not just not playing any ! any help would be great !