Progress bar wont advance
My 27" imac froze and I had to power down. it comes up with a progress bar during startup and just barely starts to show progress then it stops and will not advance after 20 min.
iMac
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Well this sounds like the HD has crashed. However before taking it into your local Apple Store or AASP for service please attempt the following:
NVRAM Reset
Reset NVRAM or PRAM on your Mac - Apple Support
Restart in Safe Mode
Use safe mode to isolate issues with your Mac - Apple Support
Restart in the Recovery Partition (Command + R on startup), then open Disk Utility and run First Aide 2-3 times. If errors appear that confirms my hunch.