After encrypting your boot disk with Symantec Drive Encryption (formerly PGP Whole Disk Encryption) the PGP BootGuard screen is not displayed and you are unable to boot your operating system. This article details connecting your disk to another Mac for troubleshooting.
Your system may display a blank screen with a Not Allowed symbol.
Although rare, you may find it necessary to recover data from an encrypted drive that has been damaged or corrupted as well as repairing the PGP MBR.
Connecting your Symantec encrypted drive to another Mac with Symantec Encryption Desktop installed via USB or FireWire can allow you to decrypt the drive and correct any issues on the disk.
Use the following steps for troubleshooting:
Connect the disk to a system with Symantec Encryption Desktop installed.
Attempt to recover the disk using the following command from the terminal application: