crwdns2934241:0crwdne2934241:0 stressmaster

crwdns2934249:0crwdne2934249:0:

A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use.

crwdns2915684:0crwdne2915684:0:

open