4 years perfect performance. Today I activated File Vault for the first time on my iMac. It shuts down and starts the reboot process. When booting up, it stops at the reset password screen. Three options available. Only key that works on my wireless keyboard is the 'tab' key which highlights "next". Neither the enter key or clicking my mouse pad works. I didn't want to change the password anyway. When it rebooted it did not give me any options to enter a password or the new File Vault Recovery Key. I then rebooted and got to the OS X Utility screen, hoping to use my time machine to reset my computer. I was able to highlight the time machine option on the menu but I could not get past that screen either by clicking enter on my keyboard or clicking the continue tab with my mouse pad. Once inside I will DE-activate File Vault. I am typing this from my iPad, Thanks for any help!!