iMac Pro won’t start up
My iMac went to a grey screen yesterday and I could not get out of it. I powered off the computer and since then when I try to restart the progress bar makes it about halfway and then the computer shuts down again
iMac Pro
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Have a look at > If your Mac starts up to an Apple logo or progress bar - Apple Support
First try Safe Mode, as per > How to use safe mode on your Mac - Apple Support
If that doesn't work, startup in macOS Recovery and use Disk Utility > Repair on the startup disk.
see > How to repair a Mac disk with Disk Utility - Apple Support