Hi. I was having an issue with my MP 4,1 -> 5,1 and used a working bootable backup to clone back to my regular startup drive to fix whatever was not quite working. But now I cannot startup and get no boot screen and can’t figure out how to be able to re-identify the working backup for booting. More specifics are: My main startup drive is a NVME drive. My backup is an internal SSD. I’m on Mojave 10.14.4 with a Sapphire Radeon 580 card. This set-up was working reasonably well, but I suddenly couldn’t get iStat to work properly and I noticed that a number of the excursion pref panes in System Utilities had disappeared. Carbon Copy Cloner creates regular startup drive backups, so I started from one of those backups fine and iStat was working fine, the pref panes were there, etc. So I backed up my regular NVMe startup drive to a third SSD for safe keeping. Then I cloned the working SSD backup to the NVMe. I re-identified the NVMe as the startup and restarted. Now nothing happens on startup and I’m not able to re-identify any other drives since I can’t get a startup screen. I can’t recall if I can throw my GT120 back in, since it’s non-Metal and I’m on Mojave. I have tried my typical trick of typing in my password to see if that might kick it into gear, but no luck. Any ideas? Basically it never seems to kick into startup mode as it’ll power right off if I hit the power button. Thanks for any advice!