My late 2011 MBP 15” won’t boot. When starting it up, I get the dong, the Apple logo, then the list of users (drive has FileVault). After selecting the user and entering the password it starts to boot as normal. When the progress bar gets about halfway across, it goes to a white screen and nothing past there. I’ve tried safe boot, multiple userids, recovery, external clone, SMC reset, and PRAM reset and nothing changes. It’s normally used in clamshell mode with a Thunderbolt Display. I’ve tried it connected and not connected with no change. Any other suggestions of what to try? My greatest fear is a bad GPU since this model is prone to that but I had escaped that problem to date. Since I need to get my taxes done I’m loading one of my time machine backups onto an old iMac to use. My anal devotion to good backups may pay off.