If this 10.5.6 is a gray disk, it is machine specific. If it is not for your machine it won't work. You would need a retail version of 10.5. It would help us to know your specific machine. Axxx number and EMC number. This information can be found in the battery compartment on most models.
If this 10.5.6 is a gray disk, it is machine specific. If it is not for your machine it won't work. You would need a retail version of 10.5. It would help us to know your specific machine. Axxx number and EMC number. This information can be found in the battery compartment on most models.