I have an iMac 800mHz flat panel witha Superdrive. Recently I've noticed it's inability to recognize audio CD's. It used to be able to read them just fine but now every time I put an audio CD in, burned or commercially bought, it tries to read it for about 45 seconds or so and then just spits it out. It reads DVD's fine. Audio CD's, not so much. Any ideas why it would be acting like this or how I can get it fixed? Thanks.