- At the back of the PS3, turn the Power switch OFF
- Hold down the Eject Power and Power button at the same time.
- While holding down both the eject and power buttons, switch the PS3 on (Switch at the back)
- Hold the buttons down for 8 seconds; it should now force the DVD to eject.
Also refer to the Playstation Help Article: http://playstation.custhelp.com/app/answers/detail/a_id/1783/~/remove-stuck-disc