Are you getting an error when you attempt to play the game, or is it crashing? Or simply not detecting the disks at all?
Try following this guide to see if you're able to resolve the issue: http://community.eu.playstation.com/t5/PlayStation
well i start the ps3 and everything is fine, i try to play on my games which are blu-ray and they do not work. howerver if i play dvds the disc is read and it will play.