What does a non-booting macbook displaying a lightning bolt mean?
That looks like the Thunderbolt logo. Your Mac probably thinks that is in Target Disk Mode.
NVRAM holds the info on where/how to boot (Target Disk Mode). You need to reset the NVRAM
That looks like the Thunderbolt logo. Your Mac probably thinks that is in Target Disk Mode.
NVRAM holds the info on where/how to boot (Target Disk Mode). You need to reset the NVRAM