Macintosh iMac Boot Issues

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  • Gray Screen Startup
  • Mac Stalls on Gray Screen

The problem is characterized by the display changing from the blue screen that occurs at power up to a gray screen (or black on more recent models) and delayed or froze on said screen.

possible culprit: bad device or peripheral

Disconnect all external peripherals, and keep them removed for the duration of these steps unless otherwise noted.

  1. Turn off your Mac by pressing and holding the power button to force it down.
  2. Make sure you remove the Ethernet cable, audio in/out cables, headphones, and any other peripherals.
  3. Restore power, turn the Mac back on again
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