Hi,
It can't find a viable OS to boot from. It sounds like you need to reinstall the OS: https://support.apple.com/en-us/HT204904
3 replies
I tried to do that and it didn't work
Are you able to boot into Recovery or Internet Recovery Mode? Exactly what happens when it doesn't work?
i like reset my computer deleted every thing of it know when i go to turn it back on it has a circle with a line ??