Pioneer 525. Played CDs as recent as a few days ago. Last night I put in the new Dixie Chicks CD and it spit it back out. Now it spits every CD out that I put in. When I put in a CD, it spins around, starts and stops whirring several times (never plays any music), and then auto-ejects the CD. Occasionally, I can hear some digital blips and clicking and on 2 tries I've heard some sort of grinding noise (mechanical sounding). It does this with all CDs I feed it. Still plays DVDs just fine, without a hitch or delay. I haven't adjusted any of the settings and went through the set-up menus just to be sure. Any ideas on what's wrong? Thanks.