A more descriptive and precise thread title will help cater to the right audience and get you more responses. (see rule #3 under How do I get help with a hardware or software problem)
To edit your thread title, just click on the
button on the bottom right of your original post and then click the "Go Advanced" button below your message.
Have you also taken a look at MRoogle, since that question may have been asked several times?
Plastic straw may work. You need to tilt the iMac so gravity will help then slide a straw in and try to get the straw at the back of card. Don't use metal you may damage the cd player.