What should you do if a disc gets stuck in the place where you put discs in on your computer

If your CD/DVD drive tray won't open then you may be able to open it using a safety pin or paper clip, this will be done by poking the paperclip or other long thin object into the emergency eject hole - NOT the audio jack!! Shown in this image: http://www.pcdoctor-guide.com/wordpress/imagesdisc-eject-1.jpg