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When starting my iMac, the progress bar gets to half way and the iMac turns itself off, doesn't switch on or reach the end of the progress bar and password stage.
iMac 21.5″, macOS 10.12
Do all of the steps, at > If your Mac doesn't turn on - Apple Support
Do all of the steps, at > If your Mac doesn't turn on - Apple Support
when starting my iMac, the progress bar gets to half way and the iMac turns itself off, doesn't switch on or get to the end of the progress bar and password stage.
