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@Si88
Quick PSA regarding Filevault...
I shut my Late-2012 iMac down for the first time since January last night. There was a thunderstorm and I wasn't too keen on my machine getting fried in the unlikely event of a power surge.
When I came to turn it back on this morning Filevault refused to accept my (correct) password at boot. It kept encouraging me to enter my (long since misplaced) recovery key or reboot into recovery mode.
Much googling and stressing led me to the source; my recently purchased Chinese eBay Magic Keyboard clone. It appears that Filevault won't accept a password from certain input devices (I assume there's an approved list or something).
Booting into the Recovery Mode gives an option along the lines of "My keyboard isn’t working when typing my password to login" at which point you can enter your password to disable Filevault and decrypt your boot drive. Trivially easy to do, to the extent I question why one prompt screen won't accept it, and another will.
TL;DR - If your Apple keyboard breaks and you're broke and purchase a cheap eBay clone to see you through, it might cause you issues booting through Filevault.