My imac pro can't boot on.
My imac pro can't boot on. the screen is black, there is a STOP iCON on the screen.
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If your Mac starts up to a circle with a line through it
A circle with a line through it means that your startup disk contains a Mac operating system, but it's not a macOS that your Mac can use.
A prohibitory symbol, which looks like a circle with a line or slash through it, means that the selected startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use.
- Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.
- Turn on your Mac and immediately press and hold Command (⌘) and R to start up from macOS Recovery.
- While in macOS Recovery, use Disk Utility to repair your startup disk.
- If Disk Utility found no errors or repaired all errors, take either of these actions:
If you still need help, please contact Apple Support.