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
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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.