2009 imac won't startup. Latest OS. We don't have startup discs anymore. White screen with apple keeps loading for hours and hours.
Yes.
Try an SMC reset:
How to reset the System Management Controller (SMC) on your Mac - Apple Support
Try starting up in Safe Mode:
Use safe mode to isolate issues with your Mac - Apple Support
If that doesn't work try booting into Recovery Mode and reinstall Mac OS:
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2009 imac won't startup. Latest OS. We don't have startup discs anymore. White screen with apple keeps loading for hours and hours.