iMac powers up but when progress bar is half way screen turns off
Wont boot up logo comes on and progress bar opens 50% then powers down
iMac 21.5", OS X 10.11
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Please read If your Mac doesn't turn on or start up - Apple Support.
Excerpt:
- If your Mac turns on but doesn't finish starting up, you might be able take steps based on the screen you see on your display.