What if my computer won't wake from sleep?
Macintosh portable computers may go into “deep sleep” mode and appear completely dead. Wake them up by momentarily pressing the power button (only press briefly, don’t keep it held down).
Published November 25, 2011 10:44 AM
Last modified on November 25, 2011 10:44 AM
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How do I reset the PRAM or NVRAM?I turn on my computer and it only shows a persistent gray screen, an Apple logo, spinning gear, spinning globe, prohibitory sign, or a folder with a flashing question mark.
I press the power button, and nothing happens. My Mac won't start.
I turn on my computer and hear a series of beeps, or I see the power LED blinking a repeating pattern.
I turn on my Mac and see a blinking prohibitory symbol, a flashing question mark, or blinking folder.
Can I make things worse by doing repairs with DiskWarrior, TechTool Pro, or similar disk repair utilities?
When I start up my Mac it stays on a blue screen and never shows the desktop.
What is a “Safe Boot” and how do I use it?
How do I reset the System Management Controller (SMC) or Power Manager (PMU)?
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