Q: Mac Pro 4,1 won't boot after FileVault encryption sequence

Hey guys,

I recently bought a Mac Pro 4,1 and replaced the standard HDD with a SSD. When I wanted to encrypt the drive, using FileVault, I got the standard reboot dialog. Upon restarting the Mac to start the encryption process the screen just stays black. I got the regular start-up chime but other than that the screen just stays dark and nothing happens. Other than the SSD, the Mac Pro 4,1 is stock.

I went into recovery mode and used the terminal to check the encryption process using this command: "diskutil cs list"

I saw that the encryption process was still running along just fine. I stayed in recovery mode until the process was completed, checking the terminal, and then tried to boot the Mac. Still, got the black screen and nothing happened. I ended up using time machine to go back before the drive was encrypted and the Mac started to boot normally.

Is there a way to resolve this problem?

Can you encrypt a SSD on a Mac Pro 4,1 using FileVault?

Please help!

Mac Pro 4,1

OS X, El Capitan, 10.11.5

SSD, Samsung EVO 850, 500GB