If your CD is stuck in your iMac, there are a few things you can do to try to free it.
If your CD is stuck in the drive, but still spinning, you can try to gently push it out from the front of the drive. Be very careful not to touch the spinning disk.
If the CD is not spinning, you can try to use a thin object like a paper clip to push it out from the hole in the back of the drive.
If these methods don’t work, you can try to open the drive and free …