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Q: Having turned on filevault, my iMac will not boot up. please help! I have a quadcore i5 iMac (mid-2011), 2.5 Ghz with 4 GBof ram i ... Having turned on filevault, my iMac will not boot up. please help! I have a quadcore i5 iMac (mid-2011), 2.5 Ghz with 4 GBof ram installed. I am using El Capitan OS. when the boot progress bar gets to the end it just switches off. any ideas? more