How do I remove a memory card from the CD/DVD slot

Carefully turn the iMac so the that gravity will help the card fall out of the drive. Gently shake the iMac to assist gravity.

Next

- Make an appointment at the Genius Bar of an Apple store.

Apple Retail Store - Genius Bar

This is the Mac Pro desktop forum I requested your post be moved to the Intel iMac forum.

Fish it out with a piece of paper cut in the shape of a hook.

Try this

http://youtu.be/9fCUZo00I5E