My iMac tries to boot up, gets halfway then shuts down.
My iMac get halfway through the boot Nd then shuts down.
iMac 21.5", macOS 10.13
My iMac get halfway through the boot Nd then shuts down.
iMac 21.5", macOS 10.13
Try booting in Safe Mode:
Use safe mode to isolate issues with your Mac - Apple Support
Try booting in Safe Mode:
Use safe mode to isolate issues with your Mac - Apple Support
My iMac tries to boot up, gets halfway then shuts down.