An iMac has 5 green vertical bars/stripes that appear on the screen as soon the system starts booting. The OS is Yosemite (10.10.?) When I try to boot the computer normally, safe boot, or diagnostics the computer gets just beyond the Apple logo with progress bar and then restarts itself. I can successfully boot into Single User Mode without the green bars appearing.
My first question is do you know of a fix/reason for the green vertical bars?
Second question: Do you know of a way to create a backup of the drive or “Macintosh HD” volume while in Single User Mode? It would be nice if the backup was bootable but not necessary. I tried “asr” command but it had issues (“could not initialize Disk Arbitration…”) in single user mode. Can some services be started so that “asr” works?
Thank you for any help