Instructions
Clean the rejected disk using a lint-free cleaning cloth. Do not use a paper towel, T-shirt or other materials, as they can scratch your disk.
Insert a different type of disk. For example, if you are trying to insert a DVD movie into the drive, insert a game or a music disk to make sure that the drive still works. The disk itself may be corrupted if the PS3 won't accept it.
Press "Game" and "Game Data Utility" from the PS3 home screen. Click the icon that represents the game you are trying to play. Click "Delete" to remove that game's data. The game data may cause the PS3 not to load the disk.
Restart the game system by pressing the "Power" button in the back of the console. Flip the switch again to power it back on. Insert the disk again.