There are occasions that the CD/DVD drive of a computer refuses to open with conventional methods. You can open with the button available on the drive, but you can also try opening through the computer by going to My Computer, right-click on the CD/DVD drive and then select EJECT. If this doesn’t work, you need to open it manually.
Get a paper clip and straighten it out. Poke the one end in the teeny tiny hole on the drive. Its location will vary depending on the make/model of the drive.
Here is a video that shows you how its done;