My CD player keeps displaying no disk and wont play the cleaner disc, is something dirty or broken?
If it does not play the cleaner disc, just inspect whether the disc inserted in spins inside it. You can check this by open the upper cover of the player, and inserting a disc into it. If inserted disc spins inside, and the player won't read it, the fault is with its laser pickup unit, and it should be replaced with same type and number.
If the disc dos not spins, the fault is with the sled motor [the motor that spins the inserted disc], has damaged, and should be replaced. OK.