Try opening and closing the cd tray a few times. I have one hybrid that seem fussy on my 9000. It will read the disc after the second or third time.
BTW, If you want to hear your 9000 in a new light, get a half dozen cardas myrtle cuboids in alternating pattern with a couple of walker resonance control discs sitting on top. Align them all in a rear to front pattern. and situate them at the center rear edge of the unit. Experiment with moving the whole collection of resonance control objects back or forth incrementally and notice how the quality of sound changes. Don't be afraid to move over the rear edge so that a part of the cuboid is hanging over. Soundstage opens up, strings become full yet transparent, bass and midrange are solid and palpable. Dial it in like you would your VTA. If you like the results, try the same procedure on all your components including power supplies. I kid you not, and anyone scoffing is invited to hear the changes on my Wisdom D-75s/ BAT VK-50SE/ Rowland 112/ Sunfire(bass amp)/Oracle mk5-Kuzma ref-Ruby2 plus audio tekne, Omega mikro, Jena, Cardas and quantum power conditioning products system.Walker resonance control mixed with Cardas Cuboids on all pieces and Dedicated 20 amp outlets too!