So I'm not able to find much information on this so I want to see if someone has done this before or have similar issues. I recently purchased a Mac Pro 4.1 quad 2.66, pretty stand stuff. I then got a OWC pcie to SSD that would allow to me to take advantage of the sata3 speed on the drive. Everything was good and I was able to boot from the SSD just fine (which Mac think it's an external drive). Then I did two things, I wipe the existing internal drive that was previously running the OS X and made it into an storage space, I also enabled FileVault on the new pcie attached SSD (the now boot drive, which the system sees it as external drive). The system told me it needs to reboot to take effect which I said okay. After the restart, I heard the usual chime and the computer would just sit there with a black screen and do nothing. I tried to get into the boot option with no luck. I then try to get into the recovery, it sort of worked but it took me to this screen called "password reset", which I don't really have anything to reset. Under the same screen there is another option called start up desk, I clicked on it and the system told me it was not able to identify the boot disk because of encryption, but I can unlock them and boot from the identifiable one. I entered the password and choose the drive I want to boot from, restarted and nothing.....it just sits there with a black screen. Might this have something to do with trying to encrypt an external pcie SSD boot drive? I have never dealt with this before so I'm not familiar with the behavior. I know that you can encrypt internal boot SSD drive just fine. Anyways any help is appreciated. I'm actually starting to think I should just get rid of the pcie to SSD and just be happy with the lower speed and less hassle getting it to setup.