I Mac pro
I have an imac pro and I had it turn on and I left with it on and when I came back it was a black screen and it won't come back on how do I fix this
iMac Pro (2017)
For starters reset the SMC, as per > Reset the SMC of your Mac - Apple Support
Desktop computer
- Shut down your Mac, then unplug the power cord.
- Wait 15 seconds, then plug the power cord back in.
- Wait 5 seconds, then press the power button to turn on your Mac.
If that does not help, reset the NVRAM, as per > Reset NVRAM on your Mac - Apple Support
How to reset NVRAM
- Shut down your Mac.
- Turn on your Mac, then immediately press and hold these four keys together: Option, Command, P, R.
- Release the keys after about 20 seconds, during which your Mac might appear to restart. For example, you might hear a startup sound more than once, or see the Apple logo more than once.
- When your Mac finishes starting up, you might need to adjust any system settings that were reset.