Mac stuck on encrypting with FileVault
My Mac desktop recently crashed, I ended up erasing the hard drive and reinstalled macOS High Sierra. A few days OK I turned in FileVault and the encryption process has stalled at about the half way point. I have tried the pervious recommendation of holding down the Command R keys, but then the start up screen shows the circle with a line through it, I am unable to move forward. Restarting the computer as normal, I can start up, but the filevault is still stuck and slows everything else down. I appreciate any suggestions. Thank you. chris
iMac 21.5″, macOS 10.13