I've made a list of several possible solutions to your problem.
Step 1. Press the button again.
If that doesn't work,
Step 2. Press the button yet another time.
If that doesn't work,
Step 3. Beat the fuck out of your computer until it obeys you.
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Step 1. Get a flathead screwdriver, one that's skinny enough to fit.
Step 2. Jam it up in that bitch.
Step 3. Wiggle it around until the CD drive opens.
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Step 1. Pray to God, and ask him for some sort of divine retribution.
If that doesn't work,
Step 2. Flipflop your allegiance to Satan and see if that does anything for you.
If that doesn't work,
Step 3. Try Praying to Allah for succor.
If that doesn't work,
Step 4. Switch to videogame gods : Saradomin, Balthazar, Dwayna, Shiva, Ramuh... Any of these could be the solution to your problem.
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Step 1. It is possible that your pc expects something in return. Offer it sacrifices of goats, oxen, or virgin girls between the ages of 6 and 17.
If that doesn't work,
Step 2. It might prefer worldly possessions. Try offering it gifts of gold, silver, and aged mahogany relics crafted in it's image.
If that doesn't work,
Step 3. It might desire you sexually. First you must discern if it is male or female. If it is male, then there is a high probability that you will be killed by an electric discharge. Proceed with caution, and whatever you do, don't insult it.
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Step 1. Call a repairman.
Step 2. When the repairman arrives, kill him.
Step 3. Fix your pc using the repairman's tools.
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Step 1. Call up a friend and have him come over. Make sure you stay out of your pc's ocular range.
Step 2. Have your friend distract the pc with a witty rejoinder involving Macs.
Step 3. While it is distracted, run into the room as quickly as you can before the pc has time to react, and tackle it to the floor.
Step 4. Employ whatever torture techniques necessary to get what you want. Water-boarding is surprisingly effective.
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Step 1. Get a newer, sexier computer.
Step 2. Set the new pc up next to the old one, and make sure you only use the newer model from then on.
Step 3. When the old computer becomes jealous/depressed enough, it will either willingly surrender it's contents or commit suicide. At this point, you may take what is yours.
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Step 1. Appeal to your pc's sense of morality. Insist that old pictures of a recently deceased friend are stored on whatever disc happens to be in it.
If that doesn't work,
Step 2. If you have a cellphone, take it out and smash it to pieces. It is common knowledge that pcs are good friends with cell phones. Once your computer knows what it means to lose a friend, it is possible that it will give up the disc willingly.
If that doesn't work,
Step 3. Beat the fuck out of your computer until it obeys you.
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I hope my advice helped!